Reverse Pairs (Leetcode 493, Lintcode 532) - 简书



Reverse Pairs (Leetcode 493, Lintcode 532) - 简书

本周竞赛题，这道题与Lintcode上面的reverse pair大同小异。这类题求个数，思路就是用merge sort. 由于两边的Array部分都是已经sort好的了，当左边的left index满足条件时，左边left往后的所有element都会满足条件，此时的个数为mid - left + 1,


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