当时想到的第一个想法是用拓展欧几里得解方程,求x的最小正解.一发交了之后发现爆long long,因为m是1e9. 因此本题的正解是暴力,保证有解的情况下,那么a数组中的一个数必然对应着b数组中的一个数,因此,可以遍历数组a,求出b[1]和a[i]对应的x的值,然后再判断是否符合其他元素即可. 要求满足(a+x)%m=b的x的值,可以通过x=((b-a)%m+m)%m,当时就是没有想到这个. 因为求最小值,所有要遍历所有可能. #include <bits/stdc++.h> using na…

Equation Modulo Equality Long Beautiful Integer Domino for Young K Integers Equation \[ Time Limit: 3 s\quad Memory Limit: 256 MB \] 这题做法很多,甚至可以直接暴力判断 view #include <map> #include <set> #include <list> #include <ctime> #include <…

Codeforces Round #609 (Div. 2)前五题题解 补题补题…… C题写挂了好几个次,最后一题看了好久题解才懂……我太迟钝了…… 然后因为longlong调了半个小时…… A.Equation 题目大意:有一个数字n,让你给出任意两个合数a,b满足a - b = n. 我们知道大于2的偶数都是合数,那么如果n为奇数,只要n加上一个奇数合数一定也为合数,如果n为偶数,那么n加上一个偶数合数也一定为合数. 因为只求任意一组,就直接选择4,9,若为奇数输出 +n 和9,偶数输出 +…

contest链接:https://codeforces.com/contest/1269 A. Equation 题意:输入一个整数,找到一个a,一个b,使得a-b=n,切a,b都是合数 思路:合数非常多,从1开始枚举b,a就是b+n,每次check一下a,b是否是合数,是的话直接输出,break即可 AC代码: #include<iostream> #include<string> #include<vector> #include<cstring> #…

B. Modulo Sum time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a sequence of numbers a1, a2, ..., an, and a number m. Check if it is possible to choose a non-empty subsequence…

http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html Hash Index Characteristics Hash indexes have somewhat different characteristics from those just discussed: They are used only for equality comparisons that use the = or <=> operators (but…

题目链接: B. Modulo Sum time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a sequence of numbers a1, a2, ..., an, and a number m. Check if it is possible to choose a non-empty subse…

Raising Modulo Numbers Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 6373   Accepted: 3760 Description People are different. Some secretly read magazines full of interesting girls' pictures, others create an A-bomb in their cellar, oth…

[Determining Equality of Objects] If you need to determine whether one object is the same as another object, it’s important to remember that you’re working with pointers. The standard C equality operator == is used to test equality between the values…

B. Modulo Sum Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/577/problem/B Description You are given a sequence of numbers a1, a2, ..., an, and a number m. Check if it is possible to choose a non-empty subsequence aij such…