82ptsWA2点求助

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<cstdlib>
#include<stack>
#include<queue>
#include<set>
#include<iomanip>
#include<vector>
#include<algorithm>
using namespace std;
const int month[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
struct date {
    int data, year;
};
date data1, data2; 
int ans;
int main()
{
    scanf("%d%d", &data1.data, &data2.data);
    data1.year = data1.data / 10000,
    data2.year = data2.data / 10000;
    for(int i = data1.year; i <= data2.year; ++i) {
        int newmonth = i % 100 / 10 + i % 10 * 10,
        newday = i / 100 % 10 * 10 + i / 1000; 
        if(i * 10000 + newmonth * 100 + newday < data1.data || 
        i * 10000 + newmonth * 100 + newday > data2.data) continue;
        if(newmonth >= 1 && newmonth <= 12) {
            if((i % 4 == 0 && i % 100 != 0) || (i % 400 == 0)) {
                if(newday >= 1 && newday <= 29) ++ans;  
            }
            else { 
                if(newday >= 1 && newday <= month[newmonth]) ++ans; 
            }
        }
    }
    printf("%d", ans);
    return 0;
}