日期差值暴力模拟

#include <iostream>
#include <cstdio>

using namespace std;

bool IsLeapYear(int year){
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
int daytab[2][13]={
    0,31,28,31,30,31,30,31,31,30,31,30,31,
    0,31,29,31,30,31,30,31,31,30,31,30,31
};
int yeartab[2]={365,366};

int main(){
    long date_1=0,date_2=0;
    while(~scanf("%d\n%d",&date_1,&date_2)){
        int day_1 = date_1%100;
        int day_2 = date_2%100;
        date_1 /=100;
        date_2 /=100;
        int month_1 = date_1%100;
        int month_2 = date_2%100;
        date_1 /=100;
        date_2 /=100;
        int year_1 = date_1;
        int year_2 = date_2;
        //printf("%d %d %d\n",year_1,month_1,day_1);
        //printf("%d %d %d\n",year_2,month_2,day_2);
        int ans = 1; //记录答案
        int yeartag,monthtag,daytag;
        for(yeartag=year_1;yeartag<year_2;yeartag++){
            ans += yeartab[IsLeapYear(yeartag)];
        }
        for(monthtag=month_1;monthtag<month_2;monthtag++){
            ans +=daytab[IsLeapYear(yeartag)][monthtag];
        }
        for(daytag=day_1;daytag<day_2;daytag++){
            ans++;
        }
        printf("%d\n",ans);
    }
}