70分
暴力出奇迹
Code:

#include <bits/stdc++.h>

using namespace std;

int main(){
    int a,b,c;
    long long ans=0;
    char d;
    cin>>a>>b>>c>>d;
    for (int i=1;i<=a;i++){
        ans+=3600;
    }
    for (int i=1;i<=b;i++){
        ans+=60;
    }
    ans+=c;
    if (d=='p')
    {
        for (int i=1;i<=12;i++){
            ans+=3600;
        }
    }
    cout<<ans;
}