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海外兔热题排行榜

题号标题题解标签难度力扣频次
141环形链表[✓]哈希表 链表 双指针🟢🀄️open in new window 🔗open in new window216
146LRU 缓存[✓]设计 哈希表 链表 1+🟠🀄️open in new window 🔗open in new window199
206反转链表[✓]递归 链表🟢🀄️open in new window 🔗open in new window196
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 window193
232用栈实现队列[✓]栈 设计 队列🟢🀄️open in new window 🔗open in new window138
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 window133
21合并两个有序链表[✓]递归 链表🟢🀄️open in new window 🔗open in new window126
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 window116
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 window112
53最大子数组和[✓]数组 分治 动态规划🟠🀄️open in new window 🔗open in new window108
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 window103
1114按序打印多线程🟢🀄️open in new window 🔗open in new window93
33搜索旋转排序数组[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window91
70爬楼梯[✓]记忆化搜索 数学 动态规划🟢🀄️open in new window 🔗open in new window86
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 window80
470用 Rand7() 实现 Rand10()数学 拒绝采样 概率与统计 1+🟠🀄️open in new window 🔗open in new window76
1143最长公共子序列[✓]字符串 动态规划🟠🀄️open in new window 🔗open in new window75
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 window65
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 window65
剑指 Offer 10-II青蛙跳台阶问题[✓]记忆化搜索 数学 动态规划🟢🀄️open in new window60
125验证回文串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window59
155最小栈[✓]栈 设计🟠🀄️open in new window 🔗open in new window59
25K 个一组翻转链表[✓]递归 链表🔴🀄️open in new window 🔗open in new window56
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 window54
5最长回文子串[✓]双指针 字符串 动态规划🟠🀄️open in new window 🔗open in new window54
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 window52
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 window52
81搜索旋转排序数组 II[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window50
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 window50
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 window50
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 window48
189轮转数组[✓]数组 数学 双指针🟠🀄️open in new window 🔗open in new window47
88合并两个有序数组[✓]数组 双指针 排序🟢🀄️open in new window 🔗open in new window47
146LRU 缓存[✓]设计 哈希表 链表 1+🟠🀄️open in new window 🔗open in new window45
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 window45
394字符串解码[✓]栈 递归 字符串🟠🀄️open in new window 🔗open in new window44
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 window44
179最大数[✓]贪心 数组 字符串 1+🟠🀄️open in new window 🔗open in new window43
69x 的平方根[✓]数学 二分查找🟢🀄️open in new window 🔗open in new window42
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 window40
83删除排序链表中的重复元素[✓]链表🟢🀄️open in new window 🔗open in new window38
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 window38
445两数相加 II[✓]栈 链表 数学🟠🀄️open in new window 🔗open in new window36
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 window36
169多数元素[✓]数组 哈希表 分治 2+🟢🀄️open in new window 🔗open in new window35
142环形链表 II[✓]哈希表 链表 双指针🟠🀄️open in new window 🔗open in new window34
56合并区间[✓]数组 排序🟠🀄️open in new window 🔗open in new window34
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 window32
128最长连续序列[✓]并查集 数组 哈希表🟠🀄️open in new window 🔗open in new window30
56合并区间[✓]数组 排序🟠🀄️open in new window 🔗open in new window30
398随机数索引[✓]水塘抽样 哈希表 数学 1+🟠🀄️open in new window 🔗open in new window30
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 window30
359日志速率限制器 🔒设计 哈希表 数据流🟢🀄️open in new window 🔗open in new window30
1048最长字符串链数组 哈希表 双指针 3+🟠🀄️open in new window 🔗open in new window29
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 window29
136只出现一次的数字[✓]位运算 数组🟢🀄️open in new window 🔗open in new window28
54螺旋矩阵[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window28
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 window28
121买卖股票的最佳时机[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window28
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 window28
157用 Read4 读取 N 个字符 🔒数组 交互 模拟🟢🀄️open in new window 🔗open in new window28
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 window26
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 window26
238除自身以外数组的乘积[✓]数组 前缀和🟠🀄️open in new window 🔗open in new window26
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 window25
264丑数 II[✓]哈希表 数学 动态规划 1+🟠🀄️open in new window 🔗open in new window24
560和为 K 的子数组[✓]数组 哈希表 前缀和🟠🀄️open in new window 🔗open in new window24
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 window23
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 window23
121买卖股票的最佳时机[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window22
75颜色分类[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window22
143重排链表[✓]栈 递归 链表 1+🟠🀄️open in new window 🔗open in new window22
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 window22
227基本计算器 II[✓]栈 数学 字符串🟠🀄️open in new window 🔗open in new window22
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 window22
692前K个高频单词字典树 哈希表 字符串 4+🟠🀄️open in new window 🔗open in new window22
33搜索旋转排序数组[✓]数组 二分查找🟠🀄️open in new window 🔗open in new window21
2两数相加[✓]递归 链表 数学🟠🀄️open in new window 🔗open in new window20
498对角线遍历[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window20
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 window20
1两数之和[✓]数组 哈希表🟢🀄️open in new window 🔗open in new window20
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 window20
138随机链表的复制[✓]哈希表 链表🟠🀄️open in new window 🔗open in new window19
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 window19
49字母异位词分组[✓]数组 哈希表 字符串 1+🟠🀄️open in new window 🔗open in new window19
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 window18
846一手顺子贪心 数组 哈希表 1+🟠🀄️open in new window 🔗open in new window18
493翻转对树状数组 线段树 数组 4+🔴🀄️open in new window 🔗open in new window18
543二叉树的直径[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window18
92反转链表 II[✓]链表🟠🀄️open in new window 🔗open in new window18
74搜索二维矩阵[✓]数组 二分查找 矩阵🟠🀄️open in new window 🔗open in new window18
1448统计二叉树中好节点的数目[✓]树 深度优先搜索 广度优先搜索 1+🟠🀄️open in new window 🔗open in new window18
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 window18
1268搜索推荐系统[✓]字典树 数组 字符串 3+🟠🀄️open in new window 🔗open in new window18
953验证外星语词典[✓]数组 哈希表 字符串🟢🀄️open in new window 🔗open in new window18
973最接近原点的 K 个点[✓]几何 数组 数学 4+🟠🀄️open in new window 🔗open in new window18
348设计井字棋 🔒设计 数组 哈希表 2+🟠🀄️open in new window 🔗open in new window18
29两数相除[✓]位运算 数学🟠🀄️open in new window 🔗open in new window18
1095山脉数组中查找目标值数组 二分查找 交互🔴🀄️open in new window 🔗open in new window18
636函数的独占时间栈 数组🟠🀄️open in new window 🔗open in new window18
160相交链表[✓]哈希表 链表 双指针🟢🀄️open in new window 🔗open in new window18
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 window17
48旋转图像[✓]数组 数学 矩阵🟠🀄️open in new window 🔗open in new window16
42接雨水[✓]栈 数组 双指针 2+🔴🀄️open in new window 🔗open in new window16
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 window16
46全排列[✓]数组 回溯🟠🀄️open in new window 🔗open in new window16
317离建筑物最近的距离 🔒广度优先搜索 数组 矩阵🔴🀄️open in new window 🔗open in new window16
14最长公共前缀[✓]字典树 字符串🟢🀄️open in new window 🔗open in new window16
48旋转图像[✓]数组 数学 矩阵🟠🀄️open in new window 🔗open in new window16
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 window16
523连续的子数组和数组 哈希表 数学 1+🟠🀄️open in new window 🔗open in new window16
273整数转换英文表示递归 数学 字符串🔴🀄️open in new window 🔗open in new window16
767重构字符串贪心 哈希表 字符串 3+🟠🀄️open in new window 🔗open in new window16
8字符串转换整数 (atoi)[✓]字符串🟠🀄️open in new window 🔗open in new window16
394字符串解码[✓]栈 递归 字符串🟠🀄️open in new window 🔗open in new window16
840矩阵中的幻方数组 哈希表 数学 1+🟠🀄️open in new window 🔗open in new window16
642设计搜索自动补全系统 🔒深度优先搜索 设计 字典树 4+🔴🀄️open in new window 🔗open in new window16
295数据流的中位数[✓]设计 双指针 数据流 2+🔴🀄️open in new window 🔗open in new window16
1547切棍子的最小成本数组 动态规划 排序🔴🀄️open in new window 🔗open in new window15
150逆波兰表达式求值[✓]栈 数组 数学🟠🀄️open in new window 🔗open in new window15
151反转字符串中的单词[✓]双指针 字符串🟠🀄️open in new window 🔗open in new window15
126单词接龙 II广度优先搜索 哈希表 字符串 1+🔴🀄️open in new window 🔗open in new window15
65有效数字字符串🔴🀄️open in new window 🔗open in new window15
1249移除无效的括号栈 字符串🟠🀄️open in new window 🔗open in new window15
1382将二叉搜索树变平衡贪心 树 深度优先搜索 3+🟠🀄️open in new window 🔗open in new window15
234回文链表[✓]栈 递归 链表 1+🟢🀄️open in new window 🔗open in new window15
1272删除区间 🔒数组🟠🀄️open in new window 🔗open in new window15
110平衡二叉树[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window15
344反转字符串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window14
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 window14
876链表的中间结点[✓]链表 双指针🟢🀄️open in new window 🔗open in new window14
76最小覆盖子串[✓]哈希表 字符串 滑动窗口🔴🀄️open in new window 🔗open in new window14
716最大栈 🔒栈 设计 链表 2+🔴🀄️open in new window 🔗open in new window14
743网络延迟时间深度优先搜索 广度优先搜索 图 2+🟠🀄️open in new window 🔗open in new window14
722删除注释数组 字符串🟠🀄️open in new window 🔗open in new window14
391完美矩形数组 扫描线🔴🀄️open in new window 🔗open in new window14
621任务调度器贪心 数组 哈希表 3+🟠🀄️open in new window 🔗open in new window14
375猜数字大小 II[✓]数学 动态规划 博弈🟠🀄️open in new window 🔗open in new window14
203移除链表元素[✓]递归 链表🟢🀄️open in new window 🔗open in new window14
1056易混淆数 🔒数学🟢🀄️open in new window 🔗open in new window14
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 window14
165比较版本号[✓]双指针 字符串🟠🀄️open in new window 🔗open in new window14
322零钱兑换[✓]广度优先搜索 数组 动态规划🟠🀄️open in new window 🔗open in new window14
253会议室 II 🔒贪心 数组 双指针 3+🟠🀄️open in new window 🔗open in new window14
445两数相加 II[✓]栈 链表 数学🟠🀄️open in new window 🔗open in new window14
472连接词深度优先搜索 字典树 数组 2+🔴🀄️open in new window 🔗open in new window14
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 window14
139单词拆分[✓]字典树 记忆化搜索 数组 3+🟠🀄️open in new window 🔗open in new window14
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 window14
543二叉树的直径[✓]树 深度优先搜索 二叉树🟢🀄️open in new window 🔗open in new window14
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 window14
347前 K 个高频元素[✓]数组 哈希表 分治 5+🟠🀄️open in new window 🔗open in new window14
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 window14
46全排列[✓]数组 回溯🟠🀄️open in new window 🔗open in new window14
54螺旋矩阵[✓]数组 矩阵 模拟🟠🀄️open in new window 🔗open in new window14
725分隔链表链表🟠🀄️open in new window 🔗open in new window14
1146快照数组[✓]设计 数组 哈希表 1+🟠🀄️open in new window 🔗open in new window14
1428至少有一个 1 的最左端列 🔒数组 二分查找 交互 1+🟠🀄️open in new window 🔗open in new window14
15三数之和[✓]数组 双指针 排序🟠🀄️open in new window 🔗open in new window14
269火星词典 🔒深度优先搜索 广度优先搜索 图 3+🔴🀄️open in new window 🔗open in new window14
340至多包含 K 个不同字符的最长子串 🔒哈希表 字符串 滑动窗口🟠🀄️open in new window 🔗open in new window14
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 window13
266回文排列 🔒位运算 哈希表 字符串🟢🀄️open in new window 🔗open in new window13
57插入区间[✓]数组🟠🀄️open in new window 🔗open in new window13
308二维区域和检索 - 矩阵可修改 🔒设计 树状数组 线段树 2+🔴🀄️open in new window 🔗open in new window13
71简化路径[✓]栈 字符串🟠🀄️open in new window 🔗open in new window13
987二叉树的垂序遍历树 深度优先搜索 广度优先搜索 3+🔴🀄️open in new window 🔗open in new window13
322零钱兑换[✓]广度优先搜索 数组 动态规划🟠🀄️open in new window 🔗open in new window12
7整数反转[✓]数学🟠🀄️open in new window 🔗open in new window12
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 window12
1631最小体力消耗路径深度优先搜索 广度优先搜索 并查集 4+🟠🀄️open in new window 🔗open in new window12
1377T 秒后青蛙的位置树 深度优先搜索 广度优先搜索 1+🔴🀄️open in new window 🔗open in new window12
632最小区间[✓]贪心 数组 哈希表 3+🔴🀄️open in new window 🔗open in new window12
1539第 k 个缺失的正整数[✓]数组 二分查找🟢🀄️open in new window 🔗open in new window12
240搜索二维矩阵 II[✓]数组 二分查找 分治 1+🟠🀄️open in new window 🔗open in new window12
125验证回文串[✓]双指针 字符串🟢🀄️open in new window 🔗open in new window12
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 window12
746使用最小花费爬楼梯[✓]数组 动态规划🟢🀄️open in new window 🔗open in new window12
158用 Read4 读取 N 个字符 II - 多次调用 🔒数组 交互 模拟🔴🀄️open in new window 🔗open in new window12
415字符串相加[✓]数学 字符串 模拟🟢🀄️open in new window 🔗open in new window12
127单词接龙[✓]广度优先搜索 哈希表 字符串🔴🀄️open in new window 🔗open in new window12
47全排列 II[✓]数组 回溯🟠🀄️open in new window 🔗open in new window12
528按权重随机选择[✓]数组 数学 二分查找 2+🟠🀄️open in new window 🔗open in new window12
867转置矩阵[✓]数组 矩阵 模拟🟢🀄️open in new window 🔗open in new window12
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 window12
1825求出 MK 平均值设计 队列 数据流 2+🔴🀄️open in new window 🔗open in new window12
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 window11
135分发糖果[✓]贪心 数组🔴🀄️open in new window 🔗open in new window11
302包含全部黑色像素的最小矩形 🔒深度优先搜索 广度优先搜索 数组 2+🔴🀄️open in new window 🔗open in new window11
63不同路径 II[✓]数组 动态规划 矩阵🟠🀄️open in new window 🔗open in new window11
45跳跃游戏 II[✓]贪心 数组 动态规划🟠🀄️open in new window 🔗open in new window11
1258近义词句子 🔒并查集 数组 哈希表 2+🟠🀄️open in new window 🔗open in new window11
42接雨水[✓]栈 数组 双指针 2+🔴🀄️open in new window 🔗open in new window11
284窥视迭代器[✓]设计 数组 迭代器🟠🀄️open in new window 🔗open in new window11
1353最多可以参加的会议数目贪心 数组 排序 1+🟠🀄️open in new window 🔗open in new window11
5最长回文子串[✓]双指针 字符串 动态规划🟠🀄️open in new window 🔗open in new window10
1254统计封闭岛屿的数目深度优先搜索 广度优先搜索 并查集 2+🟠🀄️open in new window 🔗open in new window10
1406石子游戏 III数组 数学 动态规划 1+🔴🀄️open in new window 🔗open in new window10
1762能看到海景的建筑物 🔒栈 数组 单调栈🟠🀄️open in new window 🔗open in new window10
1429第一个唯一数字 🔒设计 队列 数组 2+🟠🀄️open in new window 🔗open in new window10

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数据来源：Overseas Rabbit | 海外兔open in new window