counting 大于 n/2, n/3都可以用投票法来做
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354. Russian Doll Envelopes
354.Russian Doll Envelopes You have a number of envelopes with widths and heights given...
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longest increasing subsequence nlogn 算法
O(n^2) 算法逻辑：贪心 + 二分搜索 数据定义补充：开一个栈，将a[0]入栈，每次取栈顶元素top和读到的元素ai做比较，如果a[i]> top 则将a[i]入栈；如果...
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Some onsite algorithm questions
Write a partition algorithm employed in qsort. Analyze time cost in bad, good, mean cas...
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@liuxu good suggestion
LeetCode 202 Happy Number
Write an algorithm to determine if a number is "happy".A happy number is a number defin...
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Leetcode 240 Search a 2D Matrix II
典型老题，从右上角开始搜索，往下是增往左是减。比如.[[1 4],[2 5]]右上角元素即4 ir是行标，ic是列标假设target是2， target < 4, ic--...
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LeetCode 202 Happy Number
Write an algorithm to determine if a number is "happy".A happy number is a number defin...
