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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5.  
  6.  
  7. // Convert string HH:MM to min
  8. int convert(string s){
  9.     int a=s[0]-48;
  10.     int b=s[1]-48;
  11.     int res=(a*10+b)*60;
  12.     a=s[3]-48;
  13.     b=s[4]-48;
  14.     res+=(a*10)+b;
  15.     return res;
  16. }
  17.  
  18. void convert2(int n){
  19.     int h=n/60;
  20.     int min=n%60;
  21.     if(h<=9) cout<<"0"<<h<<":";
  22.     else cout<<h<<":";
  23.     if(min<10)cout<<"0"<<min<<"\n";
  24.     else cout<<min<<"\n";
  25. }
  26.  
  27. void solve(){
  28.     int n,k;
  29.     cin>>n>>k;
  30.     vector<int>time(1441,0);
  31.     for(int i=0;i<n;i++){
  32.         string a,b,s,e;
  33.         cin>>a>>b>>s>>e;
  34.         int t1=convert(s),t2=convert(e);
  35.         time[t1]++;
  36.         time[t2+1]--;
  37.     }
  38.     for(int i=1;i<1440;i++)time[i]+=time[i-1];
  39.     int c=0;
  40.     for(int i=0;i<1440;i++){
  41.         if(time[i]==0){
  42.             c++;
  43.         }
  44.         else c=0;
  45.         if(c==k){
  46.             convert2(i-k+1);
  47.             return;
  48.         }
  49.     }
  50.     cout<<-1<<"\n";
  51. }
  52.  
  53. int main(){
  54.     ios_base::sync_with_stdio(false);
  55.     cin.tie(NULL);
  56.     solve();
  57.     return 0;
  58. }
Success #stdin #stdout 0.01s 5332KB
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stdin
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2 60
sam sleeps 00:00 08:30
al plays 09:30 21:45
stdout
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21:46
https://ideone.com/xkQYmQ
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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