CCF CSP 201509-2 日期计算

题目链接：http://118.190.20.162/view.page?gpid=T31

题目就是给定年份以及第几天，反推几月几号。。。水

#include <iostream>
#include <algorithm>
#include <string>
#include <cstring>
#include <stack>
#include <cstdio>
using namespace std;
int n,m,i;
int isRun(int x)
{
    return x%400==0||(x%4==0&&x%100!=0);
}
int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int main()
{
    while(cin>>n>>m){
        if(isRun(n)) a[2]=29;
        else a[2]=28;
        for(i=0;i<13;i++){
            if(m>a[i]){
                m-=a[i];
            }
            else break;
        }
        cout<<i<<endl;
        cout<<m<<endl;
        //printf("%d-%02d-%02d
",n,i,m);
    }
    return 0;
}