题链;http://codeforces.com/problemset/problem/251/B B. Playing with Permutations time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Little Petya likes permutations a lot. Recently his mom has p…
2019 杭电多校 5 1004 题目链接:HDU 6627 比赛链接:2019 Multi-University Training Contest 5 Problem Description You are given two integers \(N,C\) and two integer sequences \(a\) and \(b\) of length \(N\). The sequences are indexed from \(1\) to \(N\). Please solve…
2019 杭电多校 8 1009 题目链接:HDU 6665 比赛链接:2019 Multi-University Training Contest 8 Problem Description Calabash is the servant of a landlord. The landlord owns a piece of land, which can be regarded as an infinite 2D plane. One day the landlord set up two…
题意:给定一个n和m,问你x^j + y^j = z^j 的数量有多少个,其中0 <= x <= y <= z <= m, j = 2, 3, 4, ... n. 析:是一个数学题加分类讨论.首先对 x进行分类讨论. 当 0 = x 时,只要 y = z,就行,那么就有(m+1) * (n-1) 个,因为 y 可能从0取到m ,j 可以从2取到 n. 当 0 != x 时,那么只要一个勾股定理能构成,只要幂大于2,就一下没解,所以我们把第一种中拿出j = 2时,的特殊情况,特殊考…