题解 | 计算一年中的第几天

#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define endl '\n'
int n,m,k,T;
bool check(int y){
    if(y%400==0||(y%100==0&&y%4!=0))return true;
    return false;
}
int count(int y,int m,int d){
    int cnt=0;
    switch(m-1){
        case 12:
        cnt+=31;
        case 11:
        cnt+=30;
        case 10:
        cnt+=31;
        case 9:
        cnt+=30;
        case 8:
        cnt+=31;
        case 7:
        cnt+=31;
        case 6:
        cnt+=30;
        case 5:
        cnt+=31;
        case 4:
        cnt+=30;
        case 3:
        cnt+=31;
        case 2:
        if(check(y))cnt+=29;
        else cnt+=28;
        case 1:
        cnt+=31;
    }
    return cnt+d;
}
signed main()
{
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);

    int y,m,d;
    while(cin>>y>>m>>d){
        cout<<count(y,m,d)<<endl;
    }

    return 0;
}

#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define endl '\n'
int n,m,k,T;
bool check(int y){
    if(y%400==0||(y%100==0&&y%4!=0))return true;
    return false;
}
int count(int y,int m,int d){
    int bm=1;
    int cnt=0;
    while(bm!=m){
        if(bm==1||bm==3||bm==5||bm==7||bm==8||bm==10||bm==12){
            cnt+=31;
            bm++;
        }
        else if(bm==4||bm==6||bm==9||bm==11){
            cnt+=30;
            bm++;
        }
        else if(bm==2){
            if(check(y))cnt+=29;
            else cnt+=28;
            bm++;
        }
    }
    return cnt+d;
}
signed main()
{
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    int y,m,d;
    while(cin>>y>>m>>d){
        cout<<count(y,m,d)<<endl;
    }
     
 
    return 0;
}