2020 April 30-Day LeetCoding Challenge

30-Day LeetCoding Challenge Day23: Bitwise AND of Numbers Range

30-Day LeetCoding Challenge Day22: Subarray Sum Equals K

30-Day LeetCoding Challenge Day 21: Leftmost Column with at Least a One

30-Day LeetCoding Challenge Day 20: Construct Binary Search Tree from Preorder Traversal

30-Day LeetCoding Challenge Day 19: Search in Rotated Sorted Array

好，這題要我們從一個「排序過，但後來又被移動過的」陣列裡找尋特定元素。…

30-Day LeetCoding Challenge Day 18: Minimum Path Sum

30-Day LeetCoding Challenge Day 17: Number of Islands

這一題要我們數數看地圖上有幾個「島」。一個島的定義是：所有相鄰的土地組合起來，以海與其他島隔絕。

30-Day LeetCoding Challenge Day 16: Valid Parenthesis String

30-Day LeetCoding Challenge Day 14: Perform String Shifts

這一題要我們依輸入執行字串的「偏移」。