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目录

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题号标题题解标签难度力扣
1两数之和[✓]数组 哈希表🟢🀄️open in new window 🔗open in new window
2两数相加[✓]递归 链表 数学🟠🀄️open in new window 🔗open in new window
3无重复字符的最长子串[✓]哈希表 字符串 滑动窗口🟠🀄️open in new window 🔗open in new window
4寻找两个正序数组的中位数[✓]数组 二分查找 分治🔴🀄️open in new window 🔗open in new window
5最长回文子串[✓]双指针 字符串 动态规划🟠🀄️open in new window 🔗open in new window
6Z 字形变换[✓]字符串🟠🀄️open in new window 🔗open in new window
7整数反转[✓]数学🟠🀄️open in new window 🔗open in new window
8字符串转换整数 (atoi)[✓]字符串🟠🀄️open in new window 🔗open in new window
9回文数[✓]数学🟢🀄️open in new window 🔗open in new window
10正则表达式匹配[✓]递归 字符串 动态规划🔴🀄️open in new window 🔗open in new window
11盛最多水的容器[✓]贪心 数组 双指针🟠🀄️open in new window 🔗open in new window
12整数转罗马数字[✓]哈希表 数学 字符串🟠🀄️open in new window 🔗open in new window
13罗马数字转整数[✓]哈希表 数学 字符串🟢🀄️open in new window 🔗open in new window
14最长公共前缀[✓]字典树 字符串🟢🀄️open in new window 🔗open in new window
15三数之和[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window
16最接近的三数之和[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window
17电话号码的字母组合[✓]哈希表 字符串 回溯🟠🀄️open in new window 🔗open in new window
18四数之和[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window
19删除链表的倒数第 N 个结点[✓]链表 双指针🟠🀄️open in new window 🔗open in new window
20有效的括号[✓]栈 字符串🟢🀄️open in new window 🔗open in new window
21合并两个有序链表[✓]递归 链表🟢🀄️open in new window 🔗open in new window
22括号生成[✓]字符串 动态规划 回溯🟠🀄️open in new window 🔗open in new window
23合并 K 个升序链表[✓]链表 分治 堆（优先队列） 1+🔴🀄️open in new window 🔗open in new window
24两两交换链表中的节点[✓]递归 链表🟠🀄️open in new window 🔗open in new window
25K 个一组翻转链表[✓]递归 链表🔴🀄️open in new window 🔗open in new window
26删除有序数组中的重复项[✓]数组 双指针🟢🀄️open in new window 🔗open in new window
27移除元素[✓]数组 双指针🟢🀄️open in new window 🔗open in new window
28找出字符串中第一个匹配项的下标[✓]双指针 字符串 字符串匹配🟢🀄️open in new window 🔗open in new window
29两数相除[✓]位运算 数学🟠🀄️open in new window 🔗open in new window
30串联所有单词的子串[✓]哈希表 字符串 滑动窗口🔴🀄️open in new window 🔗open in new window
31下一个排列[✓]数组 双指针🟠🀄️open in new window 🔗open in new window
32最长有效括号[✓]栈 字符串 动态规划🔴🀄️open in new window 🔗open in new window
33搜索旋转排序数组[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
34在排序数组中查找元素的第一个和最后一个位置[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
35搜索插入位置[✓]数组 二分查找🟢🀄️open in new window 🔗open in new window
36有效的数独[✓]数组 哈希表 矩阵🟠🀄️open in new window 🔗open in new window
37解数独[✓]数组 哈希表 回溯 1+🔴🀄️open in new window 🔗open in new window
38外观数列[✓]字符串🟠🀄️open in new window 🔗open in new window
39组合总和[✓]数组 回溯🟠🀄️open in new window 🔗open in new window
40组合总和 II[✓]数组 回溯🟠🀄️open in new window 🔗open in new window
41缺失的第一个正数[✓]数组 哈希表🔴🀄️open in new window 🔗open in new window
42接雨水[✓]栈 数组 双指针 2+🔴🀄️open in new window 🔗open in new window
43字符串相乘[✓]数学 字符串 模拟🟠🀄️open in new window 🔗open in new window
44通配符匹配[✓]贪心 递归 字符串 1+🔴🀄️open in new window 🔗open in new window
45跳跃游戏 II[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window
46全排列[✓]数组 回溯🟠🀄️open in new window 🔗open in new window
47全排列 II[✓]数组 回溯🟠🀄️open in new window 🔗open in new window
48旋转图像[✓]数组 数学 矩阵🟠🀄️open in new window 🔗open in new window
49字母异位词分组[✓]数组 哈希表 字符串 1+🟠🀄️open in new window 🔗open in new window
50Pow(x, n)[✓]递归 数学🟠🀄️open in new window 🔗open in new window
51N 皇后[✓]数组 回溯🔴🀄️open in new window 🔗open in new window
52N 皇后 II[✓]回溯🔴🀄️open in new window 🔗open in new window
53最大子数组和[✓]数组 分治 动态规划🟠🀄️open in new window 🔗open in new window
54螺旋矩阵[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window
55跳跃游戏[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window
56合并区间[✓]数组 排序🟠🀄️open in new window 🔗open in new window
57插入区间[✓]数组🟠🀄️open in new window 🔗open in new window
58最后一个单词的长度[✓]字符串🟢🀄️open in new window 🔗open in new window
59螺旋矩阵 II[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window
60排列序列[✓]递归 数学🔴🀄️open in new window 🔗open in new window
61旋转链表[✓]链表 双指针🟠🀄️open in new window 🔗open in new window
62不同路径[✓]数学 动态规划 组合数学🟠🀄️open in new window 🔗open in new window
63不同路径 II[✓]数组 动态规划 矩阵🟠🀄️open in new window 🔗open in new window
64最小路径和[✓]数组 动态规划 矩阵🟠🀄️open in new window 🔗open in new window
66加一[✓]数组 数学🟢🀄️open in new window 🔗open in new window
67二进制求和[✓]位运算 数学 字符串 1+🟢🀄️open in new window 🔗open in new window
68文本左右对齐[✓]数组 字符串 模拟🔴🀄️open in new window 🔗open in new window
69x 的平方根[✓]数学 二分查找🟢🀄️open in new window 🔗open in new window
70爬楼梯[✓]记忆化搜索 数学 动态规划🟢🀄️open in new window 🔗open in new window
71简化路径[✓]栈 字符串🟠🀄️open in new window 🔗open in new window
72编辑距离[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
73矩阵置零[✓]数组 哈希表 矩阵🟠🀄️open in new window 🔗open in new window
74搜索二维矩阵[✓]数组 二分查找 矩阵🟠🀄️open in new window 🔗open in new window
75颜色分类[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window
76最小覆盖子串[✓]哈希表 字符串 滑动窗口🔴🀄️open in new window 🔗open in new window
77组合[✓]回溯🟠🀄️open in new window 🔗open in new window
78子集[✓]位运算 数组 回溯🟠🀄️open in new window 🔗open in new window
79单词搜索[✓]数组 字符串 回溯 1+🟠🀄️open in new window 🔗open in new window
80删除有序数组中的重复项 II[✓]数组 双指针🟠🀄️open in new window 🔗open in new window
81搜索旋转排序数组 II[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
82删除排序链表中的重复元素 II[✓]链表 双指针🟠🀄️open in new window 🔗open in new window
83删除排序链表中的重复元素[✓]链表🟢🀄️open in new window 🔗open in new window
84柱状图中最大的矩形[✓]栈 数组 单调栈🔴🀄️open in new window 🔗open in new window
85最大矩形[✓]栈 数组 动态规划 2+🔴🀄️open in new window 🔗open in new window
86分隔链表[✓]链表 双指针🟠🀄️open in new window 🔗open in new window
88合并两个有序数组[✓]数组 双指针 排序🟢🀄️open in new window 🔗open in new window
89格雷编码[✓]位运算 数学 回溯🟠🀄️open in new window 🔗open in new window
90子集 II[✓]位运算 数组 回溯🟠🀄️open in new window 🔗open in new window
91解码方法[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
92反转链表 II[✓]链表🟠🀄️open in new window 🔗open in new window
93复原 IP 地址[✓]字符串 回溯🟠🀄️open in new window 🔗open in new window
94二叉树的中序遍历[✓]栈 树 深度优先搜索 1+🟢🀄️open in new window 🔗open in new window
95不同的二叉搜索树 II[✓]树 二叉搜索树 动态规划 2+🟠🀄️open in new window 🔗open in new window
96不同的二叉搜索树[✓]树 二叉搜索树 数学 2+🟠🀄️open in new window 🔗open in new window
97交错字符串[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
98验证二叉搜索树[✓]树 深度优先搜索 二叉搜索树 1+🟠🀄️open in new window 🔗open in new window
99恢复二叉搜索树[✓]树 深度优先搜索 二叉搜索树 1+🟠🀄️open in new window 🔗open in new window
100相同的树[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
101对称二叉树[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
102二叉树的层序遍历[✓]树 广度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
103二叉树的锯齿形层序遍历[✓]树 广度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
104二叉树的最大深度[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
105从前序与中序遍历序列构造二叉树[✓]树 数组 哈希表 2+🟠🀄️open in new window 🔗open in new window
106从中序与后序遍历序列构造二叉树[✓]树 数组 哈希表 2+🟠🀄️open in new window 🔗open in new window
107二叉树的层序遍历 II[✓]树 广度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
108将有序数组转换为二叉搜索树[✓]树 二叉搜索树 数组 2+🟢🀄️open in new window 🔗open in new window
109有序链表转换二叉搜索树[✓]树 二叉搜索树 链表 2+🟠🀄️open in new window 🔗open in new window
110平衡二叉树[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window
111二叉树的最小深度[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
112路径总和[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
113路径总和 II[✓]树 深度优先搜索 回溯 1+🟠🀄️open in new window 🔗open in new window
114二叉树展开为链表[✓]栈 树 深度优先搜索 2+🟠🀄️open in new window 🔗open in new window
115不同的子序列[✓]字符串 动态规划🔴🀄️open in new window 🔗open in new window
116填充每个节点的下一个右侧节点指针[✓]树 深度优先搜索 广度优先搜索 2+🟠🀄️open in new window 🔗open in new window
117填充每个节点的下一个右侧节点指针 II[✓]树 深度优先搜索 广度优先搜索 2+🟠🀄️open in new window 🔗open in new window
118杨辉三角[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window
119杨辉三角 II[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window
120三角形最小路径和[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
121买卖股票的最佳时机[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window
122买卖股票的最佳时机 II[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window
123买卖股票的最佳时机 III[✓]数组 动态规划🔴🀄️open in new window 🔗open in new window
124二叉树中的最大路径和[✓]树 深度优先搜索 动态规划 1+🔴🀄️open in new window 🔗open in new window
125验证回文串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
127单词接龙[✓]广度优先搜索 哈希表 字符串🔴🀄️open in new window 🔗open in new window
128最长连续序列[✓]并查集 数组 哈希表🟠🀄️open in new window 🔗open in new window
129求根节点到叶节点数字之和[✓]树 深度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
130被围绕的区域[✓]深度优先搜索 广度优先搜索 并查集 2+🟠🀄️open in new window 🔗open in new window
131分割回文串[✓]字符串 动态规划 回溯🟠🀄️open in new window 🔗open in new window
132分割回文串 II[✓]字符串 动态规划🔴🀄️open in new window 🔗open in new window
133克隆图[✓]深度优先搜索 广度优先搜索 图 1+🟠🀄️open in new window 🔗open in new window
134加油站[✓]贪心 数组🟠🀄️open in new window 🔗open in new window
135分发糖果[✓]贪心 数组🔴🀄️open in new window 🔗open in new window
136只出现一次的数字[✓]位运算 数组🟢🀄️open in new window 🔗open in new window
137只出现一次的数字 II[✓]位运算 数组🟠🀄️open in new window 🔗open in new window
138随机链表的复制[✓]哈希表 链表🟠🀄️open in new window 🔗open in new window
139单词拆分[✓]字典树 记忆化搜索 数组 3+🟠🀄️open in new window 🔗open in new window
140单词拆分 II[✓]字典树 记忆化搜索 数组 4+🔴🀄️open in new window 🔗open in new window
141环形链表[✓]哈希表 链表 双指针🟢🀄️open in new window 🔗open in new window
142环形链表 II[✓]哈希表 链表 双指针🟠🀄️open in new window 🔗open in new window
143重排链表[✓]栈 递归 链表 1+🟠🀄️open in new window 🔗open in new window
144二叉树的前序遍历[✓]栈 树 深度优先搜索 1+🟢🀄️open in new window 🔗open in new window
145二叉树的后序遍历[✓]栈 树 深度优先搜索 1+🟢🀄️open in new window 🔗open in new window
146LRU 缓存[✓]设计 哈希表 链表 1+🟠🀄️open in new window 🔗open in new window
147对链表进行插入排序[✓]链表 排序🟠🀄️open in new window 🔗open in new window
148排序链表[✓]链表 双指针 分治 2+🟠🀄️open in new window 🔗open in new window
149直线上最多的点数[✓]几何 数组 哈希表 1+🔴🀄️open in new window 🔗open in new window
150逆波兰表达式求值[✓]栈 数组 数学🟠🀄️open in new window 🔗open in new window
151反转字符串中的单词[✓]双指针 字符串🟠🀄️open in new window 🔗open in new window
152乘积最大子数组[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
153寻找旋转排序数组中的最小值[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
154寻找旋转排序数组中的最小值 II[✓]数组 二分查找🔴🀄️open in new window 🔗open in new window
155最小栈[✓]栈 设计🟠🀄️open in new window 🔗open in new window
156上下翻转二叉树 🔒[✓]树 深度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
160相交链表[✓]哈希表 链表 双指针🟢🀄️open in new window 🔗open in new window
162寻找峰值[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
164最大间距[✓]数组 桶排序 基数排序 1+🟠🀄️open in new window 🔗open in new window
165比较版本号[✓]双指针 字符串🟠🀄️open in new window 🔗open in new window
166分数到小数[✓]哈希表 数学 字符串🟠🀄️open in new window 🔗open in new window
167两数之和 II - 输入有序数组[✓]数组 双指针 二分查找🟠🀄️open in new window 🔗open in new window
168Excel 表列名称[✓]数学 字符串🟢🀄️open in new window 🔗open in new window
169多数元素[✓]数组 哈希表 分治 2+🟢🀄️open in new window 🔗open in new window
170两数之和 III - 数据结构设计 🔒[✓]设计 数组 哈希表 2+🟢🀄️open in new window 🔗open in new window
171Excel 表列序号[✓]数学 字符串🟢🀄️open in new window 🔗open in new window
172阶乘后的零[✓]数学🟠🀄️open in new window 🔗open in new window
173二叉搜索树迭代器[✓]栈 树 设计 3+🟠🀄️open in new window 🔗open in new window
174地下城游戏[✓]数组 动态规划 矩阵🔴🀄️open in new window 🔗open in new window
175组合两个表[✓]数据库🟢🀄️open in new window 🔗open in new window
177第N高的薪水[✓]数据库🟠🀄️open in new window 🔗open in new window
179最大数[✓]贪心 数组 字符串 1+🟠🀄️open in new window 🔗open in new window
181超过经理收入的员工[✓]数据库🟢🀄️open in new window 🔗open in new window
182查找重复的电子邮箱[✓]数据库🟢🀄️open in new window 🔗open in new window
183从不订购的客户[✓]数据库🟢🀄️open in new window 🔗open in new window
187重复的DNA序列[✓]位运算 哈希表 字符串 3+🟠🀄️open in new window 🔗open in new window
188买卖股票的最佳时机 IV[✓]数组 动态规划🔴🀄️open in new window 🔗open in new window
189轮转数组[✓]数组 数学 双指针🟠🀄️open in new window 🔗open in new window
190颠倒二进制位[✓]位运算 分治🟢🀄️open in new window 🔗open in new window
191位1的个数[✓]位运算 分治🟢🀄️open in new window 🔗open in new window
193有效电话号码[✓]Shell🟢🀄️open in new window 🔗open in new window
198打家劫舍[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
199二叉树的右视图[✓]树 深度优先搜索 广度优先搜索 1+🟠🀄️open in new window 🔗open in new window
200岛屿数量[✓]深度优先搜索 广度优先搜索 并查集 2+🟠🀄️open in new window 🔗open in new window
201数字范围按位与[✓]位运算🟠🀄️open in new window 🔗open in new window
202快乐数[✓]哈希表 数学 双指针🟢🀄️open in new window 🔗open in new window
203移除链表元素[✓]递归 链表🟢🀄️open in new window 🔗open in new window
204计数质数[✓]数组 数学 枚举 1+🟠🀄️open in new window 🔗open in new window
205同构字符串[✓]哈希表 字符串🟢🀄️open in new window 🔗open in new window
206反转链表[✓]递归 链表🟢🀄️open in new window 🔗open in new window
207课程表[✓]深度优先搜索 广度优先搜索 图 1+🟠🀄️open in new window 🔗open in new window
208实现 Trie (前缀树)[✓]设计 字典树 哈希表 1+🟠🀄️open in new window 🔗open in new window
209长度最小的子数组[✓]数组 二分查找 前缀和 1+🟠🀄️open in new window 🔗open in new window
210课程表 II[✓]深度优先搜索 广度优先搜索 图 1+🟠🀄️open in new window 🔗open in new window
211添加与搜索单词 - 数据结构设计[✓]深度优先搜索 设计 字典树 1+🟠🀄️open in new window 🔗open in new window
212单词搜索 II[✓]字典树 数组 字符串 2+🔴🀄️open in new window 🔗open in new window
213打家劫舍 II[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
215数组中的第K个最大元素[✓]数组 分治 快速选择 2+🟠🀄️open in new window 🔗open in new window
216组合总和 III[✓]数组 回溯🟠🀄️open in new window 🔗open in new window
217存在重复元素[✓]数组 哈希表 排序🟢🀄️open in new window 🔗open in new window
219存在重复元素 II[✓]数组 哈希表 滑动窗口🟢🀄️open in new window 🔗open in new window
221最大正方形[✓]数组 动态规划 矩阵🟠🀄️open in new window 🔗open in new window
222完全二叉树的节点个数[✓]位运算 树 二分查找 1+🟢🀄️open in new window 🔗open in new window
223矩形面积[✓]几何 数学🟠🀄️open in new window 🔗open in new window
224基本计算器[✓]栈 递归 数学 1+🔴🀄️open in new window 🔗open in new window
225用队列实现栈[✓]栈 设计 队列🟢🀄️open in new window 🔗open in new window
226翻转二叉树[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
227基本计算器 II[✓]栈 数学 字符串🟠🀄️open in new window 🔗open in new window
228汇总区间[✓]数组🟢🀄️open in new window 🔗open in new window
229多数元素 II[✓]数组 哈希表 计数 1+🟠🀄️open in new window 🔗open in new window
230二叉搜索树中第 K 小的元素[✓]树 深度优先搜索 二叉搜索树 1+🟠🀄️open in new window 🔗open in new window
2312 的幂[✓]位运算 递归 数学🟢🀄️open in new window 🔗open in new window
232用栈实现队列[✓]栈 设计 队列🟢🀄️open in new window 🔗open in new window
233数字 1 的个数[✓]递归 数学 动态规划🔴🀄️open in new window 🔗open in new window
234回文链表[✓]栈 递归 链表 1+🟢🀄️open in new window 🔗open in new window
235二叉搜索树的最近公共祖先[✓]树 深度优先搜索 二叉搜索树 1+🟠🀄️open in new window 🔗open in new window
236二叉树的最近公共祖先[✓]树 深度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
237删除链表中的节点[✓]链表🟠🀄️open in new window 🔗open in new window
238除自身以外数组的乘积[✓]数组 前缀和🟠🀄️open in new window 🔗open in new window
239滑动窗口最大值[✓]队列 数组 滑动窗口 2+🔴🀄️open in new window 🔗open in new window
240搜索二维矩阵 II[✓]数组 二分查找 分治 1+🟠🀄️open in new window 🔗open in new window
241为运算表达式设计优先级[✓]递归 记忆化搜索 数学 2+🟠🀄️open in new window 🔗open in new window
242有效的字母异位词[✓]哈希表 字符串 排序🟢🀄️open in new window 🔗open in new window
257二叉树的所有路径[✓]树 深度优先搜索 字符串 2+🟢🀄️open in new window 🔗open in new window
258各位相加[✓]数学 数论 模拟🟢🀄️open in new window 🔗open in new window
259较小的三数之和 🔒[✓]数组 双指针 二分查找 1+🟠🀄️open in new window 🔗open in new window
260只出现一次的数字 III[✓]位运算 数组🟠🀄️open in new window 🔗open in new window
263丑数[✓]数学🟢🀄️open in new window 🔗open in new window
264丑数 II[✓]哈希表 数学 动态规划 1+🟠🀄️open in new window 🔗open in new window
268丢失的数字[✓]位运算 数组 哈希表 3+🟢🀄️open in new window 🔗open in new window
274H 指数[✓]数组 计数排序 排序🟠🀄️open in new window 🔗open in new window
275H 指数 II[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
278第一个错误的版本[✓]二分查找 交互🟢🀄️open in new window 🔗open in new window
279完全平方数[✓]广度优先搜索 数学 动态规划🟠🀄️open in new window 🔗open in new window
283移动零[✓]数组 双指针🟢🀄️open in new window 🔗open in new window
284窥视迭代器[✓]设计 数组 迭代器🟠🀄️open in new window 🔗open in new window
287寻找重复数[✓]位运算 数组 双指针 1+🟠🀄️open in new window 🔗open in new window
289生命游戏[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window
290单词规律[✓]哈希表 字符串🟢🀄️open in new window 🔗open in new window
292Nim 游戏[✓]脑筋急转弯 数学 博弈🟢🀄️open in new window 🔗open in new window
295数据流的中位数[✓]设计 双指针 数据流 2+🔴🀄️open in new window 🔗open in new window
297二叉树的序列化与反序列化[✓]树 深度优先搜索 广度优先搜索 3+🔴🀄️open in new window 🔗open in new window
299猜数字游戏[✓]哈希表 字符串 计数🟠🀄️open in new window 🔗open in new window
300最长递增子序列[✓]数组 二分查找 动态规划🟠🀄️open in new window 🔗open in new window
303区域和检索 - 数组不可变[✓]设计 数组 前缀和🟢🀄️open in new window 🔗open in new window
304二维区域和检索 - 矩阵不可变[✓]设计 数组 矩阵 1+🟠🀄️open in new window 🔗open in new window
306累加数[✓]字符串 回溯🟠🀄️open in new window 🔗open in new window
307区域和检索 - 数组可修改[✓]设计 树状数组 线段树 1+🟠🀄️open in new window 🔗open in new window
309买卖股票的最佳时机含冷冻期[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
310最小高度树[✓]深度优先搜索 广度优先搜索 图 1+🟠🀄️open in new window 🔗open in new window
313超级丑数[✓]数组 数学 动态规划🟠🀄️open in new window 🔗open in new window
316去除重复字母[✓]栈 贪心 字符串 1+🟠🀄️open in new window 🔗open in new window
318最大单词长度乘积[✓]位运算 数组 字符串🟠🀄️open in new window 🔗open in new window
319灯泡开关[✓]脑筋急转弯 数学🟠🀄️open in new window 🔗open in new window
322零钱兑换[✓]广度优先搜索 数组 动态规划🟠🀄️open in new window 🔗open in new window
3263 的幂[✓]递归 数学🟢🀄️open in new window 🔗open in new window
328奇偶链表[✓]链表🟠🀄️open in new window 🔗open in new window
329矩阵中的最长递增路径[✓]深度优先搜索 广度优先搜索 图 5+🔴🀄️open in new window 🔗open in new window
331验证二叉树的前序序列化[✓]栈 树 字符串 1+🟠🀄️open in new window 🔗open in new window
334递增的三元子序列[✓]贪心 数组🟠🀄️open in new window 🔗open in new window
337打家劫舍 III[✓]树 深度优先搜索 动态规划 1+🟠🀄️open in new window 🔗open in new window
338比特位计数[✓]位运算 动态规划🟢🀄️open in new window 🔗open in new window
341扁平化嵌套列表迭代器[✓]栈 树 深度优先搜索 3+🟠🀄️open in new window 🔗open in new window
3424的幂[✓]位运算 递归 数学🟢🀄️open in new window 🔗open in new window
343整数拆分[✓]数学 动态规划🟠🀄️open in new window 🔗open in new window
344反转字符串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
345反转字符串中的元音字母[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
346数据流中的移动平均值 🔒[✓]设计 队列 数组 1+🟢🀄️open in new window 🔗open in new window
347前 K 个高频元素[✓]数组 哈希表 分治 5+🟠🀄️open in new window 🔗open in new window
349两个数组的交集[✓]数组 哈希表 双指针 2+🟢🀄️open in new window 🔗open in new window
350两个数组的交集 II[✓]数组 哈希表 双指针 2+🟢🀄️open in new window 🔗open in new window
354俄罗斯套娃信封问题[✓]数组 二分查找 动态规划 1+🔴🀄️open in new window 🔗open in new window
355设计推特[✓]设计 哈希表 链表 1+🟠🀄️open in new window 🔗open in new window
357统计各位数字都不同的数字个数[✓]数学 动态规划 回溯🟠🀄️open in new window 🔗open in new window
365水壶问题[✓]深度优先搜索 广度优先搜索 数学🟠🀄️open in new window 🔗open in new window
366寻找二叉树的叶子节点 🔒[✓]树 深度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
367有效的完全平方数[✓]数学 二分查找🟢🀄️open in new window 🔗open in new window
368最大整除子集[✓]数组 数学 动态规划 1+🟠🀄️open in new window 🔗open in new window
369给单链表加一 🔒[✓]链表 数学🟠🀄️open in new window 🔗open in new window
371两整数之和[✓]位运算 数学🟠🀄️open in new window 🔗open in new window
372超级次方[✓]数学 分治🟠🀄️open in new window 🔗open in new window
373查找和最小的 K 对数字[✓]数组 堆（优先队列）🟠🀄️open in new window 🔗open in new window
374猜数字大小[✓]二分查找 交互🟢🀄️open in new window 🔗open in new window
375猜数字大小 II[✓]数学 动态规划 博弈🟠🀄️open in new window 🔗open in new window
376摆动序列[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window
377组合总和 Ⅳ[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
378有序矩阵中第 K 小的元素[✓]数组 二分查找 矩阵 2+🟠🀄️open in new window 🔗open in new window
379电话目录管理系统 🔒[✓]设计 队列 数组 2+🟠🀄️open in new window 🔗open in new window
380O(1) 时间插入、删除和获取随机元素[✓]设计 数组 哈希表 2+🟠🀄️open in new window 🔗open in new window
381O(1) 时间插入、删除和获取随机元素 - 允许重复[✓]设计 数组 哈希表 2+🔴🀄️open in new window 🔗open in new window
382链表随机节点[✓]水塘抽样 链表 数学 1+🟠🀄️open in new window 🔗open in new window
383赎金信[✓]哈希表 字符串 计数🟢🀄️open in new window 🔗open in new window
384打乱数组[✓]数组 数学 随机化🟠🀄️open in new window 🔗open in new window
385迷你语法分析器[✓]栈 深度优先搜索 字符串🟠🀄️open in new window 🔗open in new window
386字典序排数[✓]深度优先搜索 字典树🟠🀄️open in new window 🔗open in new window
387字符串中的第一个唯一字符[✓]队列 哈希表 字符串 1+🟢🀄️open in new window 🔗open in new window
388文件的最长绝对路径[✓]栈 深度优先搜索 字符串🟠🀄️open in new window 🔗open in new window
389找不同[✓]位运算 哈希表 字符串 1+🟢🀄️open in new window 🔗open in new window
390消除游戏[✓]递归 数学🟠🀄️open in new window 🔗open in new window
392判断子序列[✓]双指针 字符串 动态规划🟢🀄️open in new window 🔗open in new window
393UTF-8 编码验证[✓]位运算 数组🟠🀄️open in new window 🔗open in new window
394字符串解码[✓]栈 递归 字符串🟠🀄️open in new window 🔗open in new window
395至少有 K 个重复字符的最长子串[✓]哈希表 字符串 分治 1+🟠🀄️open in new window 🔗open in new window
396旋转函数[✓]数组 数学 动态规划🟠🀄️open in new window 🔗open in new window
397整数替换[✓]贪心 位运算 记忆化搜索 1+🟠🀄️open in new window 🔗open in new window
398随机数索引[✓]水塘抽样 哈希表 数学 1+🟠🀄️open in new window 🔗open in new window
399除法求值[✓]深度优先搜索 广度优先搜索 并查集 4+🟠🀄️open in new window 🔗open in new window
400第 N 位数字[✓]数学 二分查找🟠🀄️open in new window 🔗open in new window
401二进制手表[✓]位运算 回溯🟢🀄️open in new window 🔗open in new window
402移掉 K 位数字[✓]栈 贪心 字符串 1+🟠🀄️open in new window 🔗open in new window
404左叶子之和[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
405数字转换为十六进制数[✓]位运算 数学🟢🀄️open in new window 🔗open in new window
406根据身高重建队列[✓]树状数组 线段树 数组 1+🟠🀄️open in new window 🔗open in new window
407接雨水 II[✓]广度优先搜索 数组 矩阵 1+🔴🀄️open in new window 🔗open in new window
409最长回文串[✓]贪心 哈希表 字符串🟢🀄️open in new window 🔗open in new window
412Fizz Buzz[✓]数学 字符串 模拟🟢🀄️open in new window 🔗open in new window
413等差数列划分[✓]数组 动态规划 滑动窗口🟠🀄️open in new window 🔗open in new window
414第三大的数[✓]数组 排序🟢🀄️open in new window 🔗open in new window
415字符串相加[✓]数学 字符串 模拟🟢🀄️open in new window 🔗open in new window
416分割等和子集[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
417太平洋大西洋水流问题[✓]深度优先搜索 广度优先搜索 数组 1+🟠🀄️open in new window 🔗open in new window
419棋盘上的战舰[✓]深度优先搜索 数组 矩阵🟠🀄️open in new window 🔗open in new window
421数组中两个数的最大异或值[✓]位运算 字典树 数组 1+🟠🀄️open in new window 🔗open in new window
423从英文中重建数字[✓]哈希表 数学 字符串🟠🀄️open in new window 🔗open in new window
424替换后的最长重复字符[✓]哈希表 字符串 滑动窗口🟠🀄️open in new window 🔗open in new window
426将二叉搜索树转化为排序的双向链表 🔒[✓]栈 树 深度优先搜索 4+🟠🀄️open in new window 🔗open in new window
427建立四叉树[✓]树 数组 分治 1+🟠🀄️open in new window 🔗open in new window
429N 叉树的层序遍历[✓]树 广度优先搜索🟠🀄️open in new window 🔗open in new window
430扁平化多级双向链表[✓]深度优先搜索 链表 双向链表🟠🀄️open in new window 🔗open in new window
432全 O(1) 的数据结构[✓]设计 哈希表 链表 1+🔴🀄️open in new window 🔗open in new window
433最小基因变化[✓]广度优先搜索 哈希表 字符串🟠🀄️open in new window 🔗open in new window
434字符串中的单词数[✓]字符串🟢🀄️open in new window 🔗open in new window
435无重叠区间[✓]贪心 数组 动态规划 1+🟠🀄️open in new window 🔗open in new window
436寻找右区间[✓]数组 二分查找 排序🟠🀄️open in new window 🔗open in new window
437路径总和 III[✓]树 深度优先搜索 二叉树🟠🀄️open in new window 🔗open in new window
438找到字符串中所有字母异位词[✓]哈希表 字符串 滑动窗口🟠🀄️open in new window 🔗open in new window
440字典序的第K小数字[✓]字典树🔴🀄️open in new window 🔗open in new window
441排列硬币[✓]数学 二分查找🟢🀄️open in new window 🔗open in new window
442数组中重复的数据[✓]数组 哈希表🟠🀄️open in new window 🔗open in new window
443压缩字符串[✓]双指针 字符串🟠🀄️open in new window 🔗open in new window
445两数相加 II[✓]栈 链表 数学🟠🀄️open in new window 🔗open in new window
447回旋镖的数量[✓]数组 哈希表 数学🟠🀄️open in new window 🔗open in new window
448找到所有数组中消失的数字[✓]数组 哈希表🟢🀄️open in new window 🔗open in new window
449序列化和反序列化二叉搜索树[✓]树 深度优先搜索 广度优先搜索 4+🟠🀄️open in new window 🔗open in new window
450删除二叉搜索树中的节点[✓]树 二叉搜索树 二叉树🟠🀄️open in new window 🔗open in new window
451根据字符出现频率排序[✓]哈希表 字符串 桶排序 3+🟠🀄️open in new window 🔗open in new window
452用最少数量的箭引爆气球[✓]贪心 数组 排序🟠🀄️open in new window 🔗open in new window
453最小操作次数使数组元素相等[✓]数组 数学🟠🀄️open in new window 🔗open in new window
454四数相加 II[✓]数组 哈希表🟠🀄️open in new window 🔗open in new window
455分发饼干[✓]贪心 数组 双指针 1+🟢🀄️open in new window 🔗open in new window
456132 模式[✓]栈 数组 二分查找 2+🟠🀄️open in new window 🔗open in new window
458可怜的小猪[✓]数学 动态规划 组合数学🔴🀄️open in new window 🔗open in new window
459重复的子字符串[✓]字符串 字符串匹配🟢🀄️open in new window 🔗open in new window
460LFU 缓存[✓]设计 哈希表 链表 1+🔴🀄️open in new window 🔗open in new window
461汉明距离[✓]位运算🟢🀄️open in new window 🔗open in new window
462最小操作次数使数组元素相等 II[✓]数组 数学 排序🟠🀄️open in new window 🔗open in new window
463岛屿的周长[✓]深度优先搜索 广度优先搜索 数组 1+🟢🀄️open in new window 🔗open in new window
464我能赢吗[✓]位运算 记忆化搜索 数学 3+🟠🀄️open in new window 🔗open in new window
467环绕字符串中唯一的子字符串[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
473火柴拼正方形[✓]位运算 数组 动态规划 2+🟠🀄️open in new window 🔗open in new window
474一和零[✓]数组 字符串 动态规划🟠🀄️open in new window 🔗open in new window
476数字的补数[✓]位运算🟢🀄️open in new window 🔗open in new window
482密钥格式化[✓]字符串🟢🀄️open in new window 🔗open in new window
485最大连续 1 的个数[✓]数组🟢🀄️open in new window 🔗open in new window
486预测赢家[✓]递归 数组 数学 2+🟠🀄️open in new window 🔗open in new window
492构造矩形[✓]数学🟢🀄️open in new window 🔗open in new window
494目标和[✓]数组 动态规划 回溯🟠🀄️open in new window 🔗open in new window
495提莫攻击[✓]数组 模拟🟢🀄️open in new window 🔗open in new window
496下一个更大元素 I[✓]栈 数组 哈希表 1+🟢🀄️open in new window 🔗open in new window
498对角线遍历[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window
500键盘行[✓]数组 哈希表 字符串🟢🀄️open in new window 🔗open in new window
501二叉搜索树中的众数[✓]树 深度优先搜索 二叉搜索树 1+🟢🀄️open in new window 🔗open in new window
502IPO[✓]贪心 数组 排序 1+🔴🀄️open in new window 🔗open in new window
503下一个更大元素 II[✓]栈 数组 单调栈🟠🀄️open in new window 🔗open in new window
504七进制数[✓]数学🟢🀄️open in new window 🔗open in new window
506相对名次[✓]数组 排序 堆（优先队列）🟢🀄️open in new window 🔗open in new window
507完美数[✓]数学🟢🀄️open in new window 🔗open in new window
509斐波那契数[✓]递归 记忆化搜索 数学 1+🟢🀄️open in new window 🔗open in new window
514自由之路[✓]深度优先搜索 广度优先搜索 字符串 1+🔴🀄️open in new window 🔗open in new window
515在每个树行中找最大值[✓]树 深度优先搜索 广度优先搜索 1+🟠🀄️open in new window 🔗open in new window
516最长回文子序列[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
518零钱兑换 II[✓]数组 动态规划🟠🀄️open in new window 🔗open in new window
520检测大写字母[✓]字符串🟢🀄️open in new window 🔗open in new window
521最长特殊序列 Ⅰ[✓]字符串🟢🀄️open in new window 🔗open in new window
526优美的排列[✓]位运算 数组 动态规划 2+🟠🀄️open in new window 🔗open in new window
528按权重随机选择[✓]数组 数学 二分查找 2+🟠🀄️open in new window 🔗open in new window
530二叉搜索树的最小绝对差[✓]树 深度优先搜索 广度优先搜索 2+🟢🀄️open in new window 🔗open in new window
540有序数组中的单一元素[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
541反转字符串 II[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
54201 矩阵[✓]广度优先搜索 数组 动态规划 1+🟠🀄️open in new window 🔗open in new window
543二叉树的直径[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window
547省份数量[✓]深度优先搜索 广度优先搜索 并查集 1+🟠🀄️open in new window 🔗open in new window
551学生出勤记录 I[✓]字符串🟢🀄️open in new window 🔗open in new window
557反转字符串中的单词 III[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
559N 叉树的最大深度[✓]树 深度优先搜索 广度优先搜索🟢🀄️open in new window 🔗open in new window
560和为 K 的子数组[✓]数组 哈希表 前缀和🟠🀄️open in new window 🔗open in new window
561数组拆分[✓]贪心 数组 计数排序 1+🟢🀄️open in new window 🔗open in new window
563二叉树的坡度[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window
566重塑矩阵[✓]数组 矩阵 模拟🟢🀄️open in new window 🔗open in new window
567字符串的排列[✓]哈希表 双指针 字符串 1+🟠🀄️open in new window 🔗open in new window
572另一棵树的子树[✓]树 深度优先搜索 二叉树 2+🟢🀄️open in new window 🔗open in new window
575分糖果[✓]数组 哈希表🟢🀄️open in new window 🔗open in new window
583两个字符串的删除操作[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
584寻找用户推荐人[✓]数据库🟢🀄️open in new window 🔗open in new window
589N 叉树的前序遍历[✓]栈 树 深度优先搜索🟢🀄️open in new window 🔗open in new window
590N 叉树的后序遍历[✓]栈 树 深度优先搜索🟢🀄️open in new window 🔗open in new window
594最长和谐子序列[✓]数组 哈希表 计数 2+🟢🀄️open in new window 🔗open in new window
595大的国家[✓]数据库🟢🀄️open in new window 🔗open in new window
598区间加法 II[✓]数组 数学🟢🀄️open in new window 🔗open in new window
599两个列表的最小索引总和[✓]数组 哈希表 字符串🟢🀄️open in new window 🔗open in new window
605种花问题[✓]贪心 数组🟢🀄️open in new window 🔗open in new window
611有效三角形的个数[✓]贪心 数组 双指针 2+🟠🀄️open in new window 🔗open in new window
617合并二叉树[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
622设计循环队列[✓]设计 队列 数组 1+🟠🀄️open in new window 🔗open in new window
628三个数的最大乘积[✓]数组 数学 排序🟢🀄️open in new window 🔗open in new window
632最小区间[✓]贪心 数组 哈希表 3+🔴🀄️open in new window 🔗open in new window
637二叉树的层平均值[✓]树 深度优先搜索 广度优先搜索 1+🟢🀄️open in new window 🔗open in new window
638大礼包[✓]位运算 记忆化搜索 数组 3+🟠🀄️open in new window 🔗open in new window
641设计循环双端队列[✓]设计 队列 数组 1+🟠🀄️open in new window 🔗open in new window
643子数组最大平均数 I[✓]数组 滑动窗口🟢🀄️open in new window 🔗open in new window
645错误的集合[✓]位运算 数组 哈希表 1+🟢🀄️open in new window 🔗open in new window
646最长数对链[✓]贪心 数组 动态规划 1+🟠🀄️open in new window 🔗open in new window
649Dota2 参议院[✓]贪心 队列 字符串🟠🀄️open in new window 🔗open in new window
653两数之和 IV - 输入二叉搜索树[✓]树 深度优先搜索 广度优先搜索 4+🟢🀄️open in new window 🔗open in new window
654最大二叉树[✓]栈 树 数组 3+🟠🀄️open in new window 🔗open in new window
657机器人能否返回原点[✓]字符串 模拟🟢🀄️open in new window 🔗open in new window
658找到 K 个最接近的元素[✓]数组 双指针 二分查找 3+🟠🀄️open in new window 🔗open in new window
661图片平滑器[✓]数组 矩阵🟢🀄️open in new window 🔗open in new window
662二叉树最大宽度[✓]树 深度优先搜索 广度优先搜索 1+🟠🀄️open in new window 🔗open in new window
670最大交换[✓]贪心 数学🟠🀄️open in new window 🔗open in new window
671二叉树中第二小的节点[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window
673最长递增子序列的个数[✓]树状数组 线段树 数组 1+🟠🀄️open in new window 🔗open in new window
674最长连续递增序列[✓]数组🟢🀄️open in new window 🔗open in new window
678有效的括号字符串[✓]栈 贪心 字符串 1+🟠🀄️open in new window 🔗open in new window
680验证回文串 II[✓]贪心 双指针 字符串🟢🀄️open in new window 🔗open in new window
682棒球比赛[✓]栈 数组 模拟🟢🀄️open in new window 🔗open in new window
684冗余连接[✓]深度优先搜索 广度优先搜索 并查集 1+🟠🀄️open in new window 🔗open in new window
689三个无重叠子数组的最大和[✓]数组 动态规划🔴🀄️open in new window 🔗open in new window
693交替位二进制数[✓]位运算🟢🀄️open in new window 🔗open in new window
695岛屿的最大面积[✓]深度优先搜索 广度优先搜索 并查集 2+🟠🀄️open in new window 🔗open in new window
696计数二进制子串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window
697数组的度[✓]数组 哈希表🟢🀄️open in new window 🔗open in new window
700二叉搜索树中的搜索[✓]树 二叉搜索树 二叉树🟢🀄️open in new window 🔗open in new window
701二叉搜索树中的插入操作[✓]树 二叉搜索树 二叉树🟠🀄️open in new window 🔗open in new window
703数据流中的第 K 大元素[✓]树 设计 二叉搜索树 3+🟢🀄️open in new window 🔗open in new window
704二分查找[✓]数组 二分查找🟢🀄️open in new window 🔗open in new window
705设计哈希集合[✓]设计 数组 哈希表 2+🟢🀄️open in new window 🔗open in new window
706设计哈希映射[✓]设计 数组 哈希表 2+🟢🀄️open in new window 🔗open in new window
707设计链表[✓]设计 链表🟠🀄️open in new window 🔗open in new window
709转换成小写字母[✓]字符串🟢🀄️open in new window 🔗open in new window
712两个字符串的最小ASCII删除和[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window
714买卖股票的最佳时机含手续费[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window
7171 比特与 2 比特字符[✓]数组🟢🀄️open in new window 🔗open in new window
724寻找数组的中心下标[✓]数组 前缀和🟢🀄️open in new window 🔗open in new window
728自除数[✓]数学🟢🀄️open in new window 🔗open in new window
729我的日程安排表 I[✓]设计 线段树 数组 2+🟠🀄️open in new window 🔗open in new window
731我的日程安排表 II[✓]设计 线段树 数组 3+🟠🀄️open in new window 🔗open in new window
733图像渲染[✓]深度优先搜索 广度优先搜索 数组 1+🟢🀄️open in new window 🔗open in new window
735小行星碰撞[✓]栈 数组 模拟🟠🀄️open in new window 🔗open in new window
739每日温度[✓]栈 数组 单调栈🟠🀄️open in new window 🔗open in new window
740删除并获得点数[✓]数组 哈希表 动态规划🟠🀄️open in new window 🔗open in new window
744寻找比目标字母大的最小字母[✓]数组 二分查找🟢🀄️open in new window 🔗open in new window
746使用最小花费爬楼梯[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window
747至少是其他数字两倍的最大数[✓]数组 排序🟢🀄️open in new window 🔗open in new window
748最短补全词[✓]数组 哈希表 字符串🟢🀄️open in new window 🔗open in new window
762二进制表示中质数个计算置位[✓]位运算 数学🟢🀄️open in new window 🔗open in new window
763划分字母区间[✓]贪心 哈希表 双指针 1+🟠🀄️open in new window 🔗open in new window
766托普利茨矩阵[✓]数组 矩阵🟢🀄️open in new window 🔗open in new window
769最多能完成排序的块[✓]栈 贪心 数组 2+🟠🀄️open in new window 🔗open in new window
771宝石与石头[✓]哈希表 字符串🟢🀄️open in new window 🔗open in new window
772基本计算器 III 🔒[✓]栈 递归 数学 1+🔴🀄️open in new window 🔗open in new window
773滑动谜题[✓]广度优先搜索 数组 矩阵🔴🀄️open in new window 🔗open in new window
783二叉搜索树节点最小距离[✓]树 深度优先搜索 广度优先搜索 2+🟢🀄️open in new window 🔗open in new window
790多米诺和托米诺平铺[✓]动态规划🟠🀄️open in new window 🔗open in new window
796旋转字符串[✓]字符串 字符串匹配🟢🀄️open in new window 🔗open in new window
802找到最终的安全状态[✓]深度优先搜索 广度优先搜索 图 1+🟠🀄️open in new window 🔗open in new window
804唯一摩尔斯密码词[✓]数组 哈希表 字符串🟢🀄️open in new window 🔗open in new window
806写字符串需要的行数[✓]数组 字符串🟢🀄️open in new window 🔗open in new window
812最大三角形面积[✓]几何 数组 数学🟢🀄️open in new window 🔗open in new window
819最常见的单词[✓]数组 哈希表 字符串 1+🟢🀄️open in new window 🔗open in new window
821字符的最短距离[✓]数组 双指针 字符串🟢🀄️open in new window 🔗open in new window
824山羊拉丁文[✓]字符串🟢🀄️open in new window 🔗open in new window
827最大人工岛[✓]深度优先搜索 广度优先搜索 并查集 2+🔴🀄️open in new window 🔗open in new window
830较大分组的位置[✓]字符串🟢🀄️open in new window 🔗open in new window
832翻转图像[✓]位运算 数组 双指针 2+🟢🀄️open in new window 🔗open in new window
836矩形重叠[✓]几何 数学🟢🀄️open in new window 🔗open in new window
841钥匙和房间[✓]深度优先搜索 广度优先搜索 图🟠🀄️open in new window 🔗open in new window
843猜猜这个单词[✓]数组 数学 字符串 2+🔴🀄️open in new window 🔗open in new window
844比较含退格的字符串[✓]栈 双指针 字符串 1+🟢🀄️open in new window 🔗open in new window
845数组中的最长山脉[✓]数组 双指针 动态规划 1+🟠🀄️open in new window 🔗open in new window
852山脉数组的峰顶索引[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
859亲密字符串[✓]哈希表 字符串🟢🀄️open in new window 🔗open in new window
860柠檬水找零[✓]贪心 数组🟢🀄️open in new window 🔗open in new window
862和至少为 K 的最短子数组[✓]队列 数组 二分查找 4+🔴🀄️open in new window 🔗open in new window
867转置矩阵[✓]数组 矩阵 模拟🟢🀄️open in new window 🔗open in new window
868二进制间距[✓]位运算🟢🀄️open in new window 🔗open in new window
872叶子相似的树[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window
873最长的斐波那契子序列的长度[✓]数组 哈希表 动态规划🟠🀄️open in new window 🔗open in new window
875爱吃香蕉的珂珂[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window
876链表的中间结点[✓]链表 双指针🟢🀄️open in new window 🔗open in new window
880索引处的解码字符串[✓]栈 字符串🟠🀄️open in new window 🔗open in new window
883三维形体投影面积[✓]几何 数组 数学 1+🟢🀄️open in new window 🔗open in new window
884两句话中的不常见单词[✓]哈希表 字符串 计数🟢🀄️open in new window 🔗open in new window

由于编译限制，本目录只展示 800 道。

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