闲的无聊，，，

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//蓝桥，高斯日记

 #include <stdio.h>
#include <iostream>
#include <string.h>
#include <math.h>
using namespace std;

int a[20] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int leap(int y)
{
    if(y%400 == 0 || (y%4==0 && y%100!=0))
    return 1;
    return 0;
}

int main()
{
    int y,m,d;
    const int Y = 1777,M = 4,D = 30;
    int day;
    while(cin>>day){
    for(m = 5;m<=12;m++)
    day-=a[m];
    y = Y+1;
    while(day>365)

{
              if(leap(y))
              day-=366;
              else
              day-=365;
              y++;
   }

 if(leap(y))
    a[2]++;
    for(m = 1;m<=12;m++)
   {
         if(day<a[m])
          break;
          day-=a[m];
    }

cout << y << "-" << m << "-" << day-1 << endl;
    }
    return 0;
}

闲的无聊，，，

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原文地址：http://www.cnblogs.com/ACWQYYY/p/4332116.html