codeforces水题100道 第七题 Codeforces Round #270 A. Design Tutorial: Learn from Math (math)
题目链接:http://www.codeforces.com/problemset/problem/472/A题意:给你一个数n,将n表示为两个合数(即非素数)的和。C++代码:#include <iostream>using namespace std;bool isprime(int x){ for (int i = 2; i * i <= ...