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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. using ll =long long;
  5.  
  6. ll convert(string s){
  7. 	ll x=int(s[0])-48;
  8. 	ll y=int(s[1])-48;
  9. 	// cout<<x<<" "<<y<<endl;
  10. 	ll z=x*10+y;
  11. 	x=int(s[3])-48;
  12. 	y=int(s[4])-48;
  13. 	return z*60+x*10+y;
  14.  
  15. }
  16.  
  17. void ck(ll g){
  18. 	ll u=g/60;
  19. 	ll y=g%60;
  20. 	if(u<=9){
  21. 		cout<<"0";
  22. 		cout<<u;
  23. 	}
  24. 	else cout<<u;
  25. 	cout<<":";
  26. 	if(y<=9){
  27. 		cout<<"0";
  28. 		cout<<y<<endl;
  29. 	}
  30. 	else cout<<y<<endl;
  31. }
  32. int main() {
  33. 	// your code goes here
  34. 	ll  n;
  35. 	cin>>n;
  36. 	ll k;
  37. 	cin>>k;
  38. 	vector<ll>y(1441,0);
  39. 	for(ll i=0;i<n;i++){
  40. 		string a,b;
  41. 		cin>>a>>b;
  42. 		string u,v;
  43. 		cin>>u>>v;
  44. 		ll t1=convert(u);
  45. 		ll t2=convert(v);
  46. 		y[t1]=y[t1]+1;
  47. 		y[t2+1]=y[t2+1]-1;
  48.  
  49. 	}
  50. 	ll i=1;
  51. 	while(i<=1440){
  52. 		y[i]=y[i]+y[i-1];
  53. 		i++;
  54. 	}
  55. 	int c=0,g=0;
  56. 	for(ll i=0;i<1440;i++){
  57. 		if(y[i]==0){
  58. 			c++;
  59. 			if(c==k){
  60. 				ck(i-k+1);
  61. 				g=1;
  62. 				break;
  63. 			}
  64. 		}
  65. 		else c=0;
  66. 	}
  67.  
  68. 	if(g==0) cout<<-1<<endl;
  69.  
  70.  
  71. 	return 0;
  72. }
Success #stdin #stdout 0s 5324KB
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2 60
sam sleep 12:00 23:59
al lunch 00:00 08:03
stdout
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08:04
https://ideone.com/4OfvjO
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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