# 第四章 - 高频考题（简单） # 简单难度题目合集 这里的题目难度比较小， 大多是模拟题，或者是很容易看出解法的题目，另外简单题目一般使用暴力法都是可以解决的。 这个时候只有看一下数据范围，思考下你的算法复杂度就行了。 当然也不排除很多 hard 题目也可以暴力模拟，大家平时多注意数据范围即可。 - [面试题 17.12. BiNode](binode-lcci.html) 🆕 - [0001.two-sum](https://github.com/azl397985856/leetcode/blob/master/problems/1.two-sum.md) - [0020.Valid Parentheses](20.valid-parentheses.html) - [0021.MergeTwoSortedLists](21.merge-two-sorted-lists.html) - [0026.remove-duplicates-from-sorted-array](26.remove-duplicates-from-sorted-array.html) - [0053.maximum-sum-subarray](53.maximum-sum-subarray-cn.html) - [0088.merge-sorted-array](88.merge-sorted-array.html) - [0101.symmetric-tree](101.symmetric-tree.html)🆕 - [0104.maximum-depth-of-binary-tree](104.maximum-depth-of-binary-tree.html) - [0108.convert-sorted-array-to-binary-search-tree](108.convert-sorted-array-to-binary-search-tree.html) - [0121.best-time-to-buy-and-sell-stock](121.best-time-to-buy-and-sell-stock.html) - [0122.best-time-to-buy-and-sell-stock-ii](122.best-time-to-buy-and-sell-stock-ii.html) - [0125.valid-palindrome](125.valid-palindrome.html) - [0136.single-number](136.single-number.html) - [0155.min-stack](155.min-stack.html) 🆕 - [0167.two-sum-ii-input-array-is-sorted](167.two-sum-ii-input-array-is-sorted.html) - [0169.majority-element](169.majority-element.html) - [0172.factorial-trailing-zeroes](172.factorial-trailing-zeroes.html) - [0190.reverse-bits](190.reverse-bits.html) - [0191.number-of-1-bits](191.number-of-1-bits.html) - [0198.house-robber](198.house-robber.html) - [0203.remove-linked-list-elements](203.remove-linked-list-elements.html) - [0206.reverse-linked-list](206.reverse-linked-list.html) - [0219.contains-duplicate-ii](219.contains-duplicate-ii.html) - [0226.invert-binary-tree](226.invert-binary-tree.html) - [0232.implement-queue-using-stacks](232.implement-queue-using-stacks.html) 🆕 - [0263.ugly-number](263.ugly-number.html) - [0283.move-zeroes](283.move-zeroes.html) - [0342.power-of-four](342.power-of-four.html) - [0349.intersection-of-two-arrays](349.intersection-of-two-arrays.html) - [0371.sum-of-two-integers](371.sum-of-two-integers.html) - [0437.path-sum-iii](437.path-sum-iii.html) 🆕 - [0455.AssignCookies](455.AssignCookies.html) 🆕 - [0575.distribute-candies](575.distribute-candies.html) - [0874.walking-robot-simulation](874.walking-robot-simulation.html) 🆕 - [1260.shift-2d-grid](1260.shift-2d-grid.html) 🆕 - [1332.remove-palindromic-subsequences](1332.remove-palindromic-subsequences.html) 🆕