1.两数之和
标签: array, hash-table
93 docs tagged with "Easy"
View all tags100.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
104.二叉树的最大深度
标签: tree, depth-first-search, 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
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
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
121.买卖股票的最佳时机
标签: array, dynamic-programming
125.验证回文字符串
标签: string, two-pointers
13.罗马数字转整数
标签: greedy, string
136.只出现一次的数字
标签: array, bit-manipulation
14.最长公共前缀
标签: string
141.环形链表
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
160.相交链表
标签: linked-list, two-pointers
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
175. 合并两个表
标签: hash-table, 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
190.翻转比特位
标签: bit-manipulation
191.位1的个数
标签: bit-manipulation
193.有效电话号码
标签: 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
20.有效的括号
标签: stack, string
202.快乐数
标签: math, hash-table
203.移除链表元素
标签: linked-list
205.同构字符串
标签: hash-table, string
206.反转链表
标签: linked-list
21.合并两个有序链表
标签: linked-list, two-pointers
217.存在重复元素
标签: array, hash-table
219.是否存在重复的元素 II
标签: array, hash-table
222.计算完全二叉树的节点数
标签: tree, binary-search, depth-first-search
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
228.汇总区间
标签: array
231.二的幂
标签: math, bit-manipulation
232.使用栈实现队列
标签: stack, design
234.回文链表
标签: linked-list, two-pointers
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
26.删除排序数组中的重复项
标签: array, two-pointers
263.丑数
标签: math
268.缺失数
标签: array, math
27.移除元素
标签: array, two-pointers
278.第一个错误的版本
标签: binary-search
28.查找字符串首次出现的索引
标签: string, two-pointers
283.移动零
标签: array, two-pointers
290.单词模式
标签: hash-table, string
292.Nim 游戏
标签: math, dynamic-programming
303. 区间和检索 - 数组不可变
标签: array, design
326.3 的幂
标签: math
338.计算各个位上1的数量
标签: dynamic-programming, bit-manipulation
342.4的幂
标签: math, bit-manipulation
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
349.两个数组的交集
标签: array, hash-table, two-pointers
35.搜索插入位置
标签: array, binary-search
350.两个数组的交集 II
标签: array, hash-table, two-pointers, sort
367.验证完全平方数
标签: math, binary-search
374.猜数字大小
标签: binary-search
383.赎金信
标签: hash-table, string
387.字符串中的第一个唯一字符
标签: hash-table, string
389.找到不同字符
标签: hash-table, string, bit-manipulation
392.判断子序列
标签: array, two-pointers, string
401.二进制手表
标签: bit-manipulation, backtracking
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
409.最长的回文
标签: hash-table, greedy
412.412. Fizz Buzz
标签: array, math
414.第三大的数
标 签: array, sort
415.字符串相加
标签: string, math
434.字符串中的单词数
标签: string
441.排列硬币
标签: math, binary-search
448.找到数组中所有消失的数字
标签: array, hash-table
58.最后单词的长度
标签: string
66.加一
标签: array, math
67.二进制求和
标签: string, math
69.Sqrt(x) 求平方根
标签: binary-search, math
70.爬楼梯
标签: dynamic-programming
83.从有序链表中删除重复项
标签: linked-list
88.合并排序数组
标签: array, two-pointers, sort
9.回文数
标签: math
94.二叉树的中序遍历
标 签: binary-search-tree, tree, stack, depth-first-search