Definition of Inversion: Let (A[0], A[1] ... A[n], n <= 50) be a sequence of n numbers. If i < j and A[i] > A[j], then the pair (i, j) is called inversion of A. Example: Count(Inversion({3, 1, 2})) = Count({3, 1}, {3, 2}) = 2 思路,假设用brute force,则O…
Ultra-QuickSort Time Limit: 7000MS Memory Limit: 65536K Total Submissions: 54883 Accepted: 20184 Description In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swappin…
Brainman Time Limit: 1000 MS Memory Limit: 30000 KB 64-bit integer IO format: %I64d , %I64u Java class name: Main [Submit] [Status] [Discuss] Description Background Raymond Babbitt drives his brother Charlie mad. Recently Raymond counted 246 toothp…
题目链接 题意 给定\(n\)个数,\(q\)个询问,每次询问\([l,r]\)区间内的逆序对数. 思路 莫队+树状数组 注意离散化 Code #include <bits/stdc++.h> #define F(i, a, b) for (int i = (a); i < (b); ++i) #define F2(i, a, b) for (int i = (a); i <= (b); ++i) #define dF(i, a, b) for (int i = (a); i &g…