听说有个模板写代码能舒服一点？

#ifdef unix
#define LLD "%lld"
#else
#define LLD "%I64d"
#endif
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <string>
#define LL long long
#define maxn 
#define INF 0x3f3f3f3f
#define rep(i, j, k) for (int i = j; i <= k; i++)
#define For(i, j) for (int i = 1; i <= j; i++)
#define lson l, mid, rt << 1
#define rson mid + 1, r, rt << 1 | 1
using namespace std;
void file(string s) {
　　string in = s + ".in", ou = s + ".out";
　　freopen(in.c_str(), "r", stdin);
　　freopen(ou.c_str(), "w", stdout);
} 

另：vim 自动加载模板配置：

autocmd BufNewFile *.cpp 0 r ~/Templates/mb.cpp  

~/Templates/mb.cpp 就是模板的目录