编写程序，用户输入年份和这一年的第一天是星期几，输出每个月的最后一天是星期几。

#include <iostream>
#include <string>
using namespace std;

string str[12]={"January 31, ","February ","March 31, ","April 30, ","May 31, ",
"June 30, ","July 31, ","August 31, ","September 30, ","October 31, ",
"November 30, ","December 31, "};
int day[12]={31,28,31,30,31,30,31,31,30,31,30,31};
string week[7]={"Sunday","Monday","Tuesday","Wednesday",
"Thursday","Friday","Saturday"};
bool IsLeapYear(int year)
{
return (year%4 == 0 && year%100 != 0) || (year % 400 == 0);
}
int main()
{
int year;
int date;
cin>>year>>date;
if(IsLeapYear(year))
day[1] += 1;
int sum=-1;
for(int i=0; i<12; ++i){
sum +=day[i];
int r