题解 | 计算日期到天数转换

#include <iostream>

using namespace std;

int main(){
    int a,b,c;
    cin>>a>>b>>c;
    int count = 0;
    int arr[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
    if(a % 4 == 0 && a % 100 != 0 || a % 400 == 0){
        arr[2] = 29;
    }else{
        arr[2] = 28;
    }
    if(b == 1){
        cout << c << endl;
    }else{
        for(int i = 1; i < b; ++i){
            count += arr[i];
        }
        count += c;
        cout << count << endl;
    }
    return 0;
}