| 830 较大分组的位置 | Positions of Large Groups | ↗ | Easy |
| 766 托普利茨矩阵 | Toepliz Matrix | ↗ | Easy |
| 747 至少是其他数字两倍的最大数 | Largest Number At Least Twice of Others | ↗ | Easy |
| 746 运用最小消费爬楼梯 | Min Cost Climbing Stairs | ↗ | Easy |
| 559 N 叉树的最大深度 | Maximum Depth of N Ary Tree | ↗ | Easy |
| 687 最长同值途径 | Longest Univalue Path | ↗ | Easy |
| 669 修剪二叉搜刮树 | Trim A Binary Search Tree | ↗ | Easy |
| 653 两数之和 IV – 输入 BST | Two Sum IV Input Is A BST | ↗ | Easy |
| 637 二叉树的层平均值 | Average of Level Values | ↗ | Easy |
| 617 兼并二叉树 | Merge Two Binary Trees | ↗ | Easy |
| 606 依据二叉树竖立字符串 | Construct String From Binary Tree | ↗ | Easy |
| 724 寻觅数组的中间索引 | Find Pivot Index | ↗ | Easy |
| 717 1 比特与 2 比特字符 | 1 Bit and 2 Bit Characters | ↗ | Easy |
| 697 数组的度 | Degree of An Array | ↗ | Easy |
| 674 最长一连递增序列 | Longest Continuous Increasing Subsequence | ↗ | Easy |
| 665 非递减数列 | Non Decreasing Array | ↗ | Easy |
| 661 图片腻滑器 | Image Smoother | ↗ | Easy |
| 643 子数组最大平均数 I | Maximum Average Subarray I | ↗ | Easy |
| 628 三个数的最大乘积 | Maximum Product of Three Numbers | ↗ | Easy |
| 605 莳花题目 | Can Place Flowers | ↗ | Easy |
| 581 最短无序一连子数组 | Shortest Unsorted Continuous Subarray | ↗ | Easy |
| 566 重塑矩阵 | Reshape the Matrix | [↗]() | Easy |
| 561 数组拆分 I | Array Partition I | ↗ | Easy |
| 532 数组中的 K-diff 数对 | K Diff Pairs in An Array | ↗ | Easy |
| 485 最大一连 1 的个数 | Max Consecutive Ones | ↗ | Easy |
| 572 另一棵树的子树 | Subtree of Another Tree | ↗ | Easy |
| 563 二叉树的坡度 | Bianry Tree Tilt | ↗ | Easy |
| 543 二叉树的直径 | Diameter of Binary Tree | ↗ | Easy |
| 538 把二叉搜刮树转换为累加树 | Converse BST to Greater Tree | ↗ | Easy |
| 501 二叉搜刮树中的众数 | Find Mode in Binary Search Tree | ↗ | Easy |
| 984 不含 AAA 或 BBB 的字符串 | String Without AAA or BBB | ↗ | Easy |
| 944 删列造序 | Delete Columns to Make Sorted | ↗ | Easy |
| 874 模仿机器人行走 | Walking Robot Simulation | ↗ | Easy |
| 860 柠檬水找零 | Lemonade Change | ↗ | Easy |
| 463 岛屿的周长 | Island Perimeter | ↗ | Easy |
| 461 汉明间隔 | Hamming Distance | ↗ | Easy |
| 459 反复的子字符串 | Repeated Substring Pattern | ↗ | Easy |
| 458 不幸的小猪 | Poor Pigs | ↗ | Easy |
| 455 分发饼干 | Assign Cookies | ↗ | Easy |
| 453 最小挪动次数使数组元素相称 | Minimum Moves to Equal Array Elements | ↗ | Easy |
| 448 找到数组中消逝的一切数字 | Find All Numbers Disappeared in An Array | ↗ | Easy |
| 447 盘旋镖的数目 | Number of Boomerangs | ↗ | Easy |
| 443 紧缩字符串 | String Compression | ↗ | Easy |
| 441 分列硬币 | Arranging Coins | ↗ | Easy |
| 438 找到字符串中一切字母异或词 | Find All Anagrams in A String | ↗ | Easy |
| 437 途径总和 III | Path Sum III | ↗ | Easy |
| 434 字符串中的单词数 | Number of Segments in A String | ↗ | Easy |
| 429 N 叉树的层序遍历 | N Ary Tree Level Order Traversal | ↗ | Easy |
| 427 竖立四叉树 | Construct Quad Tree | ↗ | Easy |
| 415 字符串相加 | Add Strings | ↗ | Easy |
| 414 第三大的数 | Third Maximum Num | ↗ | Easy |
| 412 Fizz Buzz | Fizz Buzz | ↗ | Easy |
| 409 最长回文串 | Longest Palindrome | ↗ | Easy |
| 405 数字转换为十六进制数 | Convert A Number to Hexadecimal | ↗ | Easy |
| 404 左恭弘=叶 恭弘子之和 | Sum of Left Leaves | ↗ | Easy |
| 401 二进制腕表 | Binary Watch | ↗ | Easy |
| 400 第 N 个数字 | Nth Digit | ↗ | Easy |
| 389 找差别 | Find The Difference | ↗ | Easy |
| 387 字符串中的第一个唯一字符 | First Unique Character in A String | ↗ | Easy |
| 383 赎金信 | Ronsom Note | ↗ | Easy |
| 374 猜数字大小 | Guess Number Higher or Lower | ↗ | Easy |
| 371 两整数之和 | Sum of Two Integers | ↗ | Easy |
| 367 有用的完整平方数 | Valid Perfect Square | ↗ | Easy |
| 350 两个数组的交集 II | Intersection of Two Arrays II | ↗ | Easy |
| 349 两个数组的交集 | Intersection of Two Arrays | ↗ | Easy |
| 345 反转字符串中的元音字母 | Reverse Vowels of A String | ↗ | Easy |
| 344 反转字符串 | Reverse String | ↗ | Easy |
| 342 4 的幂 | Power of Four | ↗ | Easy |
| 326 3 的幂 | Power of Three | ↗ | Easy |
| 303 地区和检索 – 数组不可变 | Range Sum Query Immutable | ↗ | Easy |
| 292 Nim 游戏 | Nim Game | ↗ | Easy |
| 290 单词形式 | Word Pattern | ↗ | Easy |
| 283 挪动零 | Move Zeroes | ↗ | Easy |
| 278 第一个毛病的版本 | First Bad Version | ↗ | Easy |
| 268 缺失数字 | Missing Number | ↗ | Easy |
| 263 丑数 | Ugly Number | ↗ | Easy |
| 258 列位相加 | Add Digits | ↗ | Easy |
| 257 二叉树的一切途径 | Binary Tree Paths | ↗ | Easy |
| 242 有用的字母异或词 | Valid Anagram | ↗ | Easy |
| 237 删除链表中的节点 | Delete Node in A Linked List | ↗ | Easy |
| 235 二叉搜刮树的近来大众先人 | Lowest Common Ancester of A Binary Search Tree | ↗ | Easy |
| 234 回文链表 | Palindrome Linked List | ↗ | Easy |
| 232 用栈完成行列 | Implement Queue Using Stacks | ↗ | Easy |
| 231 2 的幂 | Power of Two | ↗ | Easy |
| 226 翻转二叉树 | Invert Binary Tree | ↗ | Easy |
| 225 用行列完成栈 | Implement Stack Using Queues | ↗ | Easy |
| 219 存在反复元素 II | Contains Duplicate II | ↗ | Easy |
| 217 存在反复元素 | Contains Duplicate | ↗ | Easy |
| 206 反转链表 | Reverse Linked List | ↗ | Easy |
| 205 同构字符串 | Isomorphic Strings | ↗ | Easy |
| 204 计数质数 | Count Primes | ↗ | Easy |
| 203 移出链表元素 | Remove Linked List Elements | ↗ | Easy |
| 202 快活数 | Happy Number | ↗ | Easy |
| 198 打家劫舍 | House Robber | ↗ | Easy |
| 191 位 1 的个数 | Number of 1 Bits | ↗ | Easy |
| 190 倒置二进制位 | Reverse Bits | ↗ | Easy |
| 189 扭转数组 | Rotate Array | ↗ | Easy |
| 172 阶乘后的零 | Factorial Trailing Zeors | ↗ | Easy |
| 171 Excel 表列序号 | Excel Sheet Column Number | ↗ | Easy |
| 169 求众数 | Majority Element | ↗ | Easy |
| 168 Excel 表列称号 | Excel Sheet Column Title | ↗ | Easy |
| 167 两数之和 II – 输入有序数组 | Two Sum II Input Array Is Sorted | ↗ | Easy |
| 160 订交链表 | Intersection of Two Linked List | ↗ | Easy |
| 155 最小栈 | Min Stack | ↗ | Easy |
| 141 环形链表 | Linked List Code | ↗ | Easy |
| 136 只涌现一次的数字 | Single Number | ↗ | Easy |
| 125 考证回文字符串 | Valid Palindrome | ↗ | Easy |
| 122 生意股票的最佳时机 II | Best Time to Buy and Sell Stock II | ↗ | Easy |
| 121 生意股票的最佳时机 | Best Time to Buy and Sell Stock | ↗ | Easy |
| 119 杨辉三角 II | Pascals Triangle II | ↗ | Easy |
| 118 杨辉三角 | Pascals Triangle | ↗ | Easy |
| 112 途径总和 | Path Sum | ↗ | Easy |
| 111 二叉树的最小深度 | Minimum Depth of Binary Tree | ↗ | Easy |
| 110 均衡二叉树 | Balanced Binary Tree | ↗ | Easy |
| 108 将有序数组转换为二叉搜刮树 | Convert Sorted Array to Binary Search Tree | ↗ | Easy |
| 107 二叉树的条理遍历 II | Binary Tree Level Order Traversal II | ↗ | Easy |
| 104 二叉树的最大深度 | Maximum Depth of Binary Tree | ↗ | Easy |
| 101 对称二叉树 | Symmetric Tree | ↗ | Easy |
| 100 雷同的树 | Same Tree | ↗ | Easy |
| 088 兼并两个有序数组 | Merge Sorted Array | ↗ | Easy |
| 083 删除排序链表中的反复元素 | Remove Duplicates from Sorted List | ↗ | Easy |
| 070 爬楼梯 | Climbing Stairs | ↗ | Easy |
| 069 x 的平方根 | Sqrt X | ↗ | Easy |
| 068 二进制乞降 | Add Binary | ↗ | Easy |
| 066 加一 | Plus One | ↗ | Easy |
| 058 末了一个单词的长度 | Length of Last Word | ↗ | Easy |
| 053 最大子序和 | Maximum Subarray | ↗ | Easy |
| 038 报数 | Count and say | ↗ | Easy |
| 035 搜刮插进去位置 | Search Insert Position | ↗ | Easy |
| 028 完成 strStr() | Implement strStr() | ↗ | Easy |
| 027 移除元素 | Remove Element | ↗ | Easy |
| 026 删除排序数组中的反复项 | Romove Duplicates From Sorted Array | ↗ | Easy |
| 021 兼并两个有序链表 | Merge Two Sorted Lists | ↗ | Easy |
| 020 有用的括号 | Valid Parentheses | ↗ | Easy |
| 014 最长大众前缀 | Longest Common Prefix | ↗ | Easy |
| 013 罗马数字转整数 | Roman to Integer | ↗ | Easy |
| 009 回文数 | Palindrome Number | ↗ | Easy |
| 007 反转整数 | Reverse Integer | ↗ | Easy |
| 001 两数之和 | Two Sum | ↗ | Easy |
