70分求救c⌒っﾟДﾟ)っ

lan_go @ 2024-11-18 22:52:42

#include<bits/stdc++.h>
using namespace std;
const int N=1e6+5;
const int M=5050;
signed main ()
{
    int u,s;
    cin>>s>>u;
    int sj;
    sj=ceil(s/u)+10;
    int xiaoshi=8,fenzhong=0;
    fenzhong-=sj;
    while(fenzhong<0){
        fenzhong+=60;
        xiaoshi-=1;
    }
    if(xiaoshi<10){
        cout<<0<<xiaoshi<<':';
    }else cout<<xiaoshi<<':';
    if(fenzhong<10){
        cout<<0<<fenzhong-1;
    }else cout<<fenzhong-1;
    return 0;
}

by 南苑 @ 2024-11-18 23:36:00

@lan_go

#include<bits/stdc++.h>
using namespace std;
const int N=1e6+5;
const int M=5050;
signed main ()
{
    int u,s;
    cin>>s>>u;
    int sj;
    sj=ceil((s / 1.0) / u + 10);
    int xiaoshi=8,fenzhong=0;
    fenzhong-=sj;
    while(fenzhong<0){
        fenzhong+=60;
        xiaoshi-=1;
    }
    if(xiaoshi<0)xiaoshi+=24;
    if(xiaoshi<10){
        cout<<0<<xiaoshi<<':';
    }else cout<<xiaoshi<<':';
    if(fenzhong<10){
        cout<<0<<fenzhong;
    }else cout<<fenzhong;
    return 0;
}

一个问题是你while循环后xiaoshi<0的情况没考虑，一个是最后输出的时候，fenzhong-1会被一个测试点卡掉，用sj=ceil((s / 1.0) / u + 10);即可解决。

by lan_go @ 2024-11-19 22:00:08

感谢