📄️ 1.两数之和
标签: array, hash-table
📄️ 2.两数相加
标签: linked-list, math
📄️ 3.无重复字符的最长子串
标签: hash-table, string, two-pointers, dynamic-programming
📄️ 4.两个排序数组的中位数
标签: array, divide-and-conquer, binary-search
📄️ 5.最长回文子串
标签: string, dynamic-programming, two-pointers
📄️ 6.Z字形变换
标签: string
📄️ 7.整数反转
标签: math
📄️ 8.将字符串转换为整数
标签: string, math
📄️ 9.回文数
标签: math
📄️ 10.正则表达式匹配
标签: dynamic-programming, string
📄️ 11.盛最多水的容器
标签: array, two-pointers
📄️ 12.整数转罗马数字
标签: math, string
📄️ 13.罗马数字转整数
标签: greedy, string
📄️ 14.最长公共前缀
标签: string
📄️ 15.三数之和
标签: array, two-pointers, sort
📄️ 16.3Sum Closest
标签: array, two-pointers, sort
📄️ 17.电话号码的字母组合
标签: string, backtracking
📄️ 18.四数之和
标签: array, two-pointers, sort
📄️ 19.删除链表的倒数第N个节点
标签: linked-list, two-pointers
📄️ 20.有效的括号
标签: stack, string
📄️ 21.合并两个有序链表
标签: linked-list, two-pointers
📄️ 22.生成括号
标签: backtracking, string
📄️ 23.合并K个排序链表
标签: linked-list, divide-and-conquer, heap
📄️ 24.交换链表中的节点对
标签: linked-list
📄️ 25.K-组翻转链表
标签: linked-list
📄️ 26.删除排序数组中的重复项
标签: array, two-pointers
📄️ 27.移除元素
标签: array, two-pointers
📄️ 28.查找字符串首次出现的索引
标签: string, two-pointers
📄️ 29.除数问题
标签: math, binary-search
📄️ 30. 子数组的所有单词组合
标签: array, hash-table, string, two-pointers
📄️ 31.下一个排列
标签: array, two-pointers
📄️ 32.最长有效括号
标签: stack, dynamic-programming, string
📄️ 33.在旋转排序数组中搜索
标签: array, binary-search
📄️ 34.在排序数组中查找元素的第一个和最后一个位置
标签: array, binary-search
📄️ 35.搜索插入位置
标签: array, binary-search
📄️ 36.有效的数独
标签: array, hash-table
📄️ 37.数独求解器
标签: backtracking, depth-first-search
📄️ 38.报数
标签: string
📄️ 39.组合总和
标签: array, backtracking
📄️ 40. 组合总和 II
标签: array, backtracking
📄️ 41.第一个缺失的正数
标签: array
📄️ 42.接雨水
标签: array, two-pointers, dynamic-programming, stack
📄️ 43.字符串相乘
标签: string, math
📄️ 44.通配符匹配
标签: dynamic-programming, string
📄️ 45.跳跃游戏 II
标签: array, greedy
📄️ 46.全排列
标签: backtracking, array
📄️ 47.全排列 II
标签: array, backtracking
📄️ 48.旋转图像
标签: array, math
📄️ 49.分组字母异位词
标签: array, hash-table, string
📄️ 50.Pow(x, n) 幂运算
标签: math, divide-and-conquer
📄️ 51.N皇后问题
标签: backtracking
📄️ 52.N 皇后 II
标签: backtracking
📄️ 53.最大子数组和
标签: array, divide-and-conquer, dynamic-programming
📄️ 54.螺旋矩阵
标签: array, math, greedy
📄️ 55.跳跃游戏
标签: array, greedy
📄️ 56.合并区间
标签: array, sort
📄️ 57.插入区间
标签: array, sort
📄️ 58.最后单词的长度
标签: string
📄️ 59.螺旋矩阵 II
标签: array, math
📄️ 60.排列序列
标签: math, backtracking
📄️ 61.旋转链表
标签: linked-list, two-pointers
📄️ 62.独特路径
标签: dynamic-programming, math
📄️ 63.路径总数 II
标签: array, dynamic-programming
📄️ 64.最小路径和
标签: array, dynamic-programming
📄️ 65.有效数字
标签: string
📄️ 66.加一
标签: array, math
📄️ 67.二进制求和
标签: string, math
📄️ 68.文本对齐
标签: greedy, string
📄️ 69.Sqrt(x) 求平方根
标签: binary-search, math
📄️ 70.爬楼梯
标签: dynamic-programming
📄️ 71.简化路径
标签: string, stack
📄️ 72.编辑距离
标签: dynamic-programming, string
📄️ 73.矩阵置零
标签: array, hash-table
📄️ 74.搜索二维矩阵
标签: array, binary-search
📄️ 75.颜色分类
标签: array, two-pointers, sort
📄️ 76.最小覆盖子串
标签: two-pointers, hash-table, string, queue
📄️ 77.组合
标签: backtracking
📄️ 78.子集
标签: array, backtracking, bit-manipulation
📄️ 79.单词搜索
标签: array, backtracking, depth-first-search
📄️ 80.删除排序数组中的重复项 II
标签: array, two-pointers
📄️ 81.在旋转排序数组中搜索 II
标签: array, binary-search
📄️ 82.删除排序链表中的重复元素 II
标签: linked-list, two-pointers
📄️ 83.从有序链表中删除重复项
标签: linked-list
📄️ 84.直方图中的最大矩形
标签: array, stack, dynamic-programming
📄️ 85.最大矩形
标签: array, dynamic-programming, stack
📄️ 86.分隔链表
标签: linked-list, two-pointers
📄️ 87.扰乱字符串
标签: dynamic-programming, string
📄️ 88.合并排序数组
标签: array, two-pointers, sort
📄️ 89.格雷码
标签: bit-manipulation, math, backtracking
📄️ 90.子集 II
标签: backtracking
📄️ 91.解码方法
标签: dynamic-programming, string
📄️ 92.反转链表 II
标签: linked-list
📄️ 93.还原IP地址
标签: string, backtracking
📄️ 94.二叉树的中序遍历
标签: binary-search-tree, tree, stack, depth-first-search
📄️ 95.不同的二叉搜索树 II
标签: dynamic-programming, tree, binary-search-tree, backtracking
📄️ 96.不同的二叉搜索树
标签: dynamic-programming, tree
📄️ 97.交错字符串
标签: dynamic-programming, string
📄️ 98.验证二叉搜索树
标签: tree, depth-first-search, binary-search-tree
📄️ 99.恢复二叉搜索树
标签: tree, depth-first-search, binary-search-tree
📄️ 100.相同的树
标签: tree, depth-first-search
📄️ 101.对称二叉树
标签: tree, depth-first-search, breadth-first-search
📄️ 102.二叉树层序遍历
标签: tree, breadth-first-search
📄️ 103.二叉树之字形层序遍历
标签: tree, breadth-first-search
📄️ 104.二叉树的最大深度
标签: tree, depth-first-search, breadth-first-search
📄️ 105.从前序与中序遍历序列构造二叉树
标签: tree, array, divide-and-conquer, binary-search-tree
📄️ 106.从中序与后序遍历序列构造二叉树
标签: tree, array, depth-first-search
📄️ 107.二叉树的层序遍历 II
标签: tree, breadth-first-search
📄️ 108.将有序数组转换为二叉搜索树
标签: binary-search-tree, divide-and-conquer, tree
📄️ 109.将有序链表转换为二叉搜索树
标签: linked-list, tree, divide-and-conquer, depth-first-search
📄️ 110.平衡二叉树
标签: tree, depth-first-search, binary-search-tree
📄️ 111.二叉树的最小深度
标签: tree, breadth-first-search, depth-first-search
📄️ 112.路径总和
标签: tree, depth-first-search, binary-search-tree
📄️ 113.路径总和 II
标签: tree, binary-search-tree, backtracking, depth-first-search
📄️ 114.展开二叉树为链表
标签: tree, depth-first-search
📄️ 115.不同的子序列
标签: dynamic-programming, string
📄️ 116.填充每个节点的下一个右侧节点指针
标签: tree, depth-first-search, breadth-first-search
📄️ 117.填充每个节点的下一个右侧节点指针 II
标签: tree, breadth-first-search, depth-first-search
📄️ 118.帕斯卡三角形
标签: array, dynamic-programming
📄️ 119.帕斯卡三角形 II
标签: array, dynamic-programming
📄️ 120.三角形
标签: dynamic-programming
📄️ 121.买卖股票的最佳时机
标签: array, dynamic-programming
📄️ 122.买卖股票的最佳时机 II
标签: array, greedy
📄️ 123.买卖股票的最佳时机 III
标签: dynamic-programming
📄️ 124.二叉树中的最大路径和
标签: tree, depth-first-search, dynamic-programming
📄️ 125.验证回文字符串
标签: string, two-pointers
📄️ 126.单词接龙 II
标签: breadth-first-search, backtracking
📄️ 127.单词接龙
标签: breadth-first-search, hash-table
📄️ 128.最长连续序列
标签: array, hash-table, union-find
📄️ 129.路径总和从根到叶
标签: tree, depth-first-search, binary-search-tree
📄️ 130.被围绕的区域
标签: depth-first-search, breadth-first-search, graph
📄️ 131.分割回文串
标签: backtracking, string, dynamic-programming
📄️ 132.回文分割 II
标签: dynamic-programming, string
📄️ 133.克隆图
标签: depth-first-search, breadth-first-search, graph, hash-table
📄️ 134.加油站
标签: greedy, array
📄️ 135.糖果问题
标签: array, greedy
📄️ 136.只出现一次的数字
标签: array, bit-manipulation
📄️ 137.只出现一次的数字II
标签: bit-manipulation, array
📄️ 138.复制带随机指针的链表
标签: linked-list, hash-table
📄️ 139.单词拆分
标签: dynamic-programming, hash-table
📄️ 140.单词拆分 II
标签: dynamic-programming, backtracking
📄️ 141.环形链表
标签: linked-list, two-pointers
📄️ 142.链表中的环 II
标签: linked-list, two-pointers
📄️ 143.重排链表
标签: linked-list, two-pointers
📄️ 144.二叉树的前序遍历
标签: tree, depth-first-search, stack
📄️ 145.二叉树的后序遍历
标签: tree, depth-first-search, stack
📄️ 146.LRU缓存
标签: design, hash-table, linked-list
📄️ 147.插入排序链表
标签: linked-list, sort
📄️ 148.排序链表
标签: linked-list, sort, divide-and-conquer
📄️ 149.同一直线上的最多点数
标签: hash-table, math, array
📄️ 150.逆波兰表达式求值
标签: stack
📄️ 151.翻转字符串里的单词
标签: string
📄️ 152.最大乘积子数组
标签: array, dynamic-programming
📄️ 153.寻找旋转排序数组中的最小值
标签: array, binary-search
📄️ 154.寻找旋转排序数组中的最小值 II
标签: array, binary-search
📄️ 155.最小栈
标签: stack, design
📄️ 160.相交链表
标签: linked-list, two-pointers
📄️ 162.寻找峰值
标签: array, binary-search
📄️ 164.最大邻接差
标签: array, sort, math
📄️ 165.版本号比较
标签: string
📄️ 166.分数转化为循环小数
标签: math, hash-table, string
📄️ 167.两数之和 II - 输入有序数组
标签: array, two-pointers, binary-search
📄️ 168.Excel工作表列标题
标签: math
📄️ 169.多数元素
标签: array, divide-and-conquer, hash-table, sort
📄️ 171.Excel 表列序号
标签: math, string
📄️ 172.阶乘尾数
标签: math
📄️ 173.二叉搜索树迭代器
标签: stack, tree, design, binary-search-tree
📄️ 174.地牢游戏
标签: dynamic-programming, array
📄️ 175. 合并两个表
标签: hash-table, design
📄️ 176.第二高的薪水
标签: sort, math
📄️ 177.第N高的薪水
标签: sort, design, math
📄️ 178.排名分数
标签: array, sort
📄️ 179.最大数
标签: string, sort
📄️ 180.连续的数字
标签: array, design
📄️ 181.工资高于经理的员工
标签: hash-table, sort
📄️ 182.重复的电子邮箱
标签: hash-table, string, map
📄️ 183.从未下订单的客户
标签: hash-table, design
📄️ 184.部门最高薪水
标签: array, hash-table, sort
📄️ 185.部门前三高工资
标签: hash-table, sort, design
📄️ 187.重复的DNA序列
标签: hash-table, string, bit-manipulation
📄️ 188.买卖股票的最佳时机 IV
标签: dynamic-programming
📄️ 189.旋转数组
标签: array, two-pointers
📄️ 190.翻转比特位
标签: bit-manipulation
📄️ 191.位1的个数
标签: bit-manipulation
📄️ 192.单词频率
标签: string, sort
📄️ 193.有效电话号码
标签: string
📄️ 194.转置文件
标签: array, string
📄️ 195.第十行
标签: string
📄️ 196.删除重复的电子邮箱
标签: hash-table, design
📄️ 197.温度上升
标签: math, hash-table, greedy, array
📄️ 198.打家劫舍
标签: dynamic-programming, array
📄️ 199.二叉树的右视图
标签: tree, depth-first-search, breadth-first-search
📄️ 200.岛屿数量
标签: depth-first-search, breadth-first-search, union-find
📄️ 201.数字范围按位与
标签: bit-manipulation
📄️ 202.快乐数
标签: math, hash-table
📄️ 203.移除链表元素
标签: linked-list
📄️ 204.计算质数
标签: math, array
📄️ 205.同构字符串
标签: hash-table, string
📄️ 206.反转链表
标签: linked-list
📄️ 207.课程表
标签: graph, depth-first-search, breadth-first-search, topological-sort
📄️ 208.实现 Trie (前缀树)
标签: trie, design
📄️ 209.最小长度子数组和
标签: array, two-pointers, binary-search
📄️ 210.课程安排 II
标签: graph, topological-sort, depth-first-search, breadth-first-search
📄️ 211.设计添加和搜索单词的数据结构
标签: trie, design, string
📄️ 212.单词搜索 II
标签: trie, backtracking
📄️ 213.打家劫舍 II
标签: dynamic-programming
📄️ 214.最短回文串
标签: string, two-pointers, greedy
📄️ 215.数组中的第K个最大元素
标签: array, divide-and-conquer, heap
📄️ 216.组合总和 III
标签: backtracking
📄️ 217.存在重复元素
标签: array, hash-table
📄️ 218.天际线问题
标签: divide-and-conquer, heap
📄️ 219.是否存在重复的元素 II
标签: array, hash-table
📄️ 220.存在重复值 III
标签: array, binary-search, sort, two-pointers
📄️ 221.最大正方形
标签: dynamic-programming, array
📄️ 222.计算完全二叉树的节点数
标签: tree, binary-search, depth-first-search
📄️ 223.矩形面积
标签: math, array
📄️ 224.基本计算器
标签: stack, string
📄️ 225.用队列实现栈
标签: stack, queue, design
📄️ 226.翻转二叉树
标签: tree, depth-first-search, breadth-first-search
📄️ 227.基本计算器 II
标签: stack, string
📄️ 228.汇总区间
标签: array
📄️ 229.求众数 II
标签: array, hash-table
📄️ 230.二叉搜索树中第K小的元素
标签: tree, binary-search-tree, depth-first-search
📄️ 231.二的幂
标签: math, bit-manipulation
📄️ 232.使用栈实现队列
标签: stack, design
📄️ 233.数字 1 的个数
标签: math, dynamic-programming
📄️ 234.回文链表
标签: linked-list, two-pointers
📄️ 235.二叉搜索树的最近公共祖先
标签: tree, binary-search-tree, depth-first-search
📄️ 236.二叉树的最近公共祖先
标签: tree, depth-first-search
📄️ 237.删除链表中的节点
标签: linked-list
📄️ 238.除自身以外数组的乘积
标签: array, dynamic-programming
📄️ 239.滑动窗口最大值
标签: array, heap, queue, two-pointers
📄️ 240.搜索二维矩阵 II
标签: array, binary-search, divide-and-conquer
📄️ 241.不同方法加括号
标签: divide-and-conquer, dynamic-programming
📄️ 242.有效的字母异位词
标签: hash-table, string, sort
📄️ 257.二叉树路径
标签: tree, depth-first-search, backtracking
📄️ 258.各位数字相加
标签: math
📄️ 260.只出现一次的数字 III
标签: bit-manipulation, array
📄️ 262.行程和用户
标签: hash-table, sort, string
📄️ 263.丑数
标签: math
📄️ 264.丑数 II
标签: dynamic-programming, heap, math
📄️ 268.缺失数
标签: array, math
📄️ 273.整数转英文单词
标签: string, math
📄️ 274.H 指数
标签: array, sort
📄️ 275.H 指数 II
标签: binary-search, array
📄️ 278.第一个错误的版本
标签: binary-search
📄️ 279.最少的完全平方数
标签: dynamic-programming, breadth-first-search, math
📄️ 282.表达式添加运算符
标签: backtracking, string, dynamic-programming
📄️ 283.移动零
标签: array, two-pointers
📄️ 284.设计支持peek操作的迭代器
标签: design, array, stack
📄️ 287.寻找重复数
标签: array, two-pointers, binary-search
📄️ 289.生命游戏
标签: array, design
📄️ 290.单词模式
标签: hash-table, string
📄️ 292.Nim 游戏
标签: math, dynamic-programming
📄️ 295.从数据流中找到中位数
标签: heap, design
📄️ 297.序列化与反序列化二叉树
标签: tree, design
📄️ 299.公牛与母牛游戏
标签: hash-table, string
📄️ 300.最长递增子序列
标签: array, binary-search, dynamic-programming
📄️ 301.移除无效的括号
标签: backtracking, depth-first-search, breadth-first-search, string
📄️ 303. 区间和检索 - 数组不可变
标签: array, design
📄️ 304.二维区域和检索 - 矩阵不可变
标签: array, dynamic-programming
📄️ 306.累加数
标签: backtracking, string
📄️ 307.区域和检索 - 可变
标签: segment-tree, binary-indexed-tree, array
📄️ 309.最佳买卖股票时机含冷冻期
标签: dynamic-programming
📄️ 310.树的最小高度
标签: tree, breadth-first-search, graph
📄️ 312.戳气球
标签: dynamic-programming
📄️ 313.超级丑数
标签: heap, math
📄️ 315.计算右侧小于当前元素的数
标签: array, binary-indexed-tree, binary-search, divide-and-conquer
📄️ 316.去除重复字母
标签: stack, greedy
📄️ 318.最大单词长度乘积
标签: bit-manipulation, array
📄️ 319.灯泡开关
标签: math
📄️ 321.创建最大数
标签: array, dynamic-programming, greedy
📄️ 322.硬币兑换
标签: dynamic-programming, breadth-first-search
📄️ 324.摆动排序 II
标签: array, sort
📄️ 326.3 的幂
标签: math
📄️ 327.区间和的个数
标签: array, binary-search, divide-and-conquer
📄️ 328.奇偶链表
标签: linked-list
📄️ 329.矩阵中的最长递增路径
标签: depth-first-search, dynamic-programming, graph
📄️ 330.补丁数组
标签: greedy, math
📄️ 331.验证二叉树的前序序列化
标签: stack, string
📄️ 332.重建行程
标签: depth-first-search, graph
📄️ 334.递增的三元子序列
标签: array, greedy
📄️ 335.自相交路径
标签: array, math, greedy
📄️ 336.回文对
标签: trie, string, hash-table
📄️ 337.打家劫舍 III
标签: dynamic-programming, tree, depth-first-search
📄️ 338.计算各个位上1的数量
标签: dynamic-programming, bit-manipulation
📄️ 341.展开嵌套列表迭代器
标签: stack, design
📄️ 342.4的幂
标签: math, bit-manipulation
📄️ 343.整数拆分
标签: math, dynamic-programming
📄️ 344.反转字符串
标签: two-pointers, array
📄️ 345.翻转字符串中的元音字母
标签: two-pointers, string
📄️ 347.前K个高频元素
标签: hash-table, heap, sort
📄️ 349.两个数组的交集
标签: array, hash-table, two-pointers
📄️ 350.两个数组的交集 II
标签: array, hash-table, two-pointers, sort
📄️ 352.数据流中的不相交区间
标签: design, binary-search, array
📄️ 354.俄罗斯套娃信封问题
标签: dynamic-programming, binary-search
📄️ 355.设计Twitter
标签: design, hash-table, heap
📄️ 357. 统计各位数字都不同的数字个数
标签: math, dynamic-programming, backtracking
📄️ 363.不大于K的最大矩形和
标签: array, dynamic-programming, binary-search, divide-and-conquer
📄️ 365.水壶问题
标签: math, breadth-first-search
📄️ 367.验证完全平方数
标签: math, binary-search
📄️ 368.最大的可整除子集
标签: dynamic-programming, sort
📄️ 371.两整数之和
标签: bit-manipulation
📄️ 372.超级次幂
标签: math
📄️ 373.寻找和最小的K对数
标签: array, heap, greedy
📄️ 374.猜数字大小
标签: binary-search
📄️ 375.猜数字大小 II
标签: dynamic-programming
📄️ 376.摆动序列
标签: greedy, dynamic-programming
📄️ 377.组合总和 IV
标签: dynamic-programming, array
📄️ 378.有序矩阵中的第 K 小元素
标签: array, binary-search, heap
📄️ 380.380. 插入 删除 和随机获取 O(1)
标签: hash-table, design
📄️ 381.插入删除获取随机元素 - O(1) 时间复杂度（允许重复）
标签: design, array, hash-table
📄️ 382.链表随机节点
标签: reservoir-sampling, linked-list
📄️ 383.赎金信
标签: hash-table, string
📄️ 384.打乱数组
标签: array, design
📄️ 385.Mini 解析器
标签: stack, string
📄️ 386.词典序排列
标签: depth-first-search, sort
📄️ 387.字符串中的第一个唯一字符
标签: hash-table, string
📄️ 388.最长绝对文件路径
标签: string, stack
📄️ 389.找到不同字符
标签: hash-table, string, bit-manipulation
📄️ 390.消除游戏
标签: math, array
📄️ 391.完美矩形
标签: array, math, hash-table
📄️ 392.判断子序列
标签: array, two-pointers, string
📄️ 393.UTF-8 验证
标签: array, string, bit-manipulation
📄️ 394. 解码字符串
标签: stack, string
📄️ 395.至少有K个重复字符的最长子串
标签: divide-and-conquer, string
📄️ 396.旋转函数
标签: array, math
📄️ 397.整数替换
标签: dynamic-programming, math
📄️ 398.随机选择索引
标签: reservoir-sampling, hash-table, design
📄️ 399. Evaluate Division
标签: graph, union-find, depth-first-search
📄️ 400.第N位数字
标签: math
📄️ 401.二进制手表
标签: bit-manipulation, backtracking
📄️ 402.移除K位数字
标签: stack, greedy
📄️ 403.青蛙过河
标签: dynamic-programming, depth-first-search
📄️ 404.左叶子之和
标签: tree, depth-first-search, breadth-first-search
📄️ 405.将数字转换为十六进制
标签: math, bit-manipulation
📄️ 406.根据身高重建队列
标签: array, sort, greedy
📄️ 407.接雨水 II
标签: heap, breadth-first-search
📄️ 409.最长的回文
标签: hash-table, greedy
📄️ 410.分割数组的最大子数组和
标签: binary-search, dynamic-programming
📄️ 412.412. Fizz Buzz
标签: array, math
📄️ 413.等差数列片段
标签: array, dynamic-programming
📄️ 414.第三大的数
标签: array, sort
📄️ 415.字符串相加
标签: string, math
📄️ 416.分割等和子集
标签: array, dynamic-programming
📄️ 417.太平洋大西洋水流问题
标签: depth-first-search, breadth-first-search, graph
📄️ 419. 船舰在棋盘上
标签: array, depth-first-search
📄️ 420.密码强度检验器
标签: greedy, string
📄️ 421.数组中两个数的最大异或值
标签: trie, bit-manipulation
📄️ 423.重建英文表示的原始数字
标签: hash-table, string
📄️ 424.最长重复字符替换
标签: two-pointers, string, greedy, hash-table
📄️ 427.构造四叉树
标签: tree, divide-and-conquer, depth-first-search
📄️ 429.N叉树的层序遍历
标签: tree, breadth-first-search
📄️ 430.扁平化多级双向链表
标签: linked-list, depth-first-search
📄️ 432.全O(1)的数据结构
标签: design, hash-table, linked-list
📄️ 433.最小基因变化
标签: breadth-first-search, hash-table
📄️ 434.字符串中的单词数
标签: string
📄️ 435. 无重叠区间
标签: greedy, sort
📄️ 436.寻找右区间
标签: array, binary-search, sort
📄️ 437.路径总和 III
标签: tree, depth-first-search
📄️ 438.在字符串中找到所有字母异位词
标签: array, hash-table, two-pointers, string, sort, sort, binary-search
📄️ 440.字典序的第K小数字
标签: math, depth-first-search, trie
📄️ 441.排列硬币
标签: math, binary-search
📄️ 442.寻找数组中的重复数
标签: array, hash-table
📄️ 443.字符串压缩
标签: array, two-pointers
📄️ 445.两数相加 II
标签: linked-list, stack
📄️ 446.等差数列 II - 子序列
标签: array, dynamic-programming
📄️ 447.回旋镖的数量
标签: array, hash-table
📄️ 448.找到数组中所有消失的数字
标签: array, hash-table
📄️ 449.序列化和反序列化二叉搜索树
标签: tree, design
📄️ 450.删除二叉搜索树中的节点
标签: tree, binary-search-tree
📄️ 451.按频率排序字符
标签: hash-table, sort, string
📄️ 452.射爆气球的最小箭数
标签: greedy, sort
📄️ 453.使数组元素相等的最小操作次数
标签: array, math