题解 | 日期差值

#include <iostream>
#include <ctime>
using namespace std;
int daysBetweenDates(struct tm date1, struct tm date2) {
    time_t t1 = mktime(&date1);
    time_t t2 = mktime(&date2);
    double diff = difftime(t2, t1) / (60 * 60 * 24);
    return static_cast<int>(diff);
}

int main() {
    struct tm date1 = {0};
    struct tm date2 = {0};
    int input1;
    cin >> input1;
    date1.tm_year = input1 / 10000-1900; 
    date1.tm_mon = (input1 / 100) % 100-1; 
    date1.tm_mday = input1 % 100;           
    int input2;
    cin >> input2;
    date2.tm_year = input2 / 10000-1900;  
    date2.tm_mon = (input2 / 100) % 100-1; 
    date2.tm_mday = input2 % 100;           
    int result = daysBetweenDates(date1, date2);
    cout <<  result+1 << endl;

    return 0;
}