原创 【LeetCode 225】 Implement Stack using Queues
題目描述 Implement the following operations of a stack using queues. push(x) – Push element x onto stack. pop() – Remov
2020-05-20 20:31:13
原创 【LeetCode 376】Wiggle Subsequence
題目描述 A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alter
2020-05-20 20:31:13
原创 【LeetCode 402】 Remove K Digits
題目描述 Given a non-negative integer num represented as a string, remove k digits from the number so that the new numb
2020-05-20 20:31:13
原创 【LeetCode 78】 Subsets
題目描述 Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set mu
2020-05-20 20:31:03
原创 【LeetCode 455】Assign Cookies
題目描述 Assume you are an awesome parent and want to give your children some cookies. But, you should give each child
2020-05-20 20:31:03
原创 【LeetCode 452】 Minimum Number of Arrows to Burst Balloons
題目描述 There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is
2020-05-20 20:31:03
原创 【LeetCode 90】 Subsets II
題目描述 Given a collection of integers that might contain duplicates, nums, return all possible subsets (the power set
2020-05-20 20:31:03
原创 【LeetCode 473】 Matchsticks to Square
題目描述 Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little match girl has,
2020-05-20 20:31:03
原创 【LeetCode 51】 N-Queens
題目描述 The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack eac
2020-05-20 20:30:53
原创 【LeetCode 239】 Sliding Window Maximum
題目描述 Given an array nums, there is a sliding window of size k which is moving from the very left of the array to th
2020-05-13 19:08:25
原创 【LeetCode 698】Partition to K Equal Sum Subsets
題目描述 Given an array of integers nums and a positive integer k, find whether it’s possible to divide this array into
2020-05-13 19:08:25
原创 【LeetCode 209】 Minimum Size Subarray Sum
題目描述 Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarr
2020-05-13 19:08:25
原创 【LeetCode 329】Longest Increasing Path in a Matrix
題目描述 Given an integer matrix, find the length of the longest increasing path. From each cell, you can either move t
2020-05-11 10:18:37
原创 【面試題 & LeetCode 367】 Valid Perfect Square
題目描述 判斷一個數是否是平方數。 思路 平方數可以拆成一個等差數列的和。 代碼 class Solution { public: bool isPerfectSquare(int num) { int c
2020-05-11 10:18:37
原创 【LeetCode 474】 Ones and Zeroes
題目描述 Given an array, strs, with strings consisting of only 0s and 1s. Also two integers m and n. Now your task is t
2020-05-11 10:18:37