题解 | #计算日期到天数转换#

#include<iostream>
#include<vector>
#include<map>
using namespace std;
int main()
{
    int year,month,day;
    while(cin>>year>>month>>day)
    {
        map<int,int>mpday;
        mpday[1]=31;
        mpday[3]=31;
        mpday[4]=30;
        mpday[5]=31;
        mpday[6]=30;
        mpday[7]=31;
        mpday[8]=31;
        mpday[9]=30;
        mpday[10]=31;
        mpday[11]=30;
        mpday[12]=31;
        if((year%4==0&&year%100!=0)||year%400==0)
        {
            mpday[2]=29;
        }
        else
        {
            mpday[2]=28;
        }
        int res=0;
        for(int i=1;i<month;i++)
        {
            res+=mpday.find(i)->second;
        }
        res+=day;
        cout<<res<<endl;
    }
    return 0;
}