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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int convert(string s){
  6.     int u1 = int(s[0])-48;
  7.     int u5 = int(s[1])-48;
  8.  
  9.     int v = (u1*10 + u5)*60;
  10.  
  11.     u1 = int(s[3])-48;
  12.     u5 = int(s[4])-48;
  13.  
  14.     v = v + (u1*10 + u5);
  15.  
  16.     return v;
  17. }
  18.  
  19. void ck(int g){
  20. 	int u = g/60;
  21. 	int y = g%60;
  22.  
  23. 	if(u<=9){
  24. 		cout<<"0";
  25. 		cout<<u;
  26. 	}
  27. 	else{
  28. 		cout<<u;
  29. 	}
  30. 	cout<<":";
  31.  
  32. 	if(y<=9){
  33. 		cout<<"0";
  34. 		cout<<y;
  35. 	}
  36. 	else{
  37. 		cout<<y;
  38. 	}
  39. }
  40.  
  41. int main() {
  42.     int n;
  43.     cin>>n;
  44.  
  45.     int k ; 
  46.     cin>>k;
  47.  
  48.     int y[1445] = {0}; // increased size slightly to prevent overflow
  49.  
  50.     for(int i=0;i<n;i++){
  51.         string a,b,v1,v5;
  52.         cin>>a>>b>>v1>>v5;
  53.  
  54.         int t1 = convert(v1);
  55.         int t5 = convert(v5);
  56.  
  57.         y[t1] = y[t1] + 1; 
  58.         if(t5 + 1 < 1440) { // boundary check added
  59.             y[t5+1] = y[t5+1] - 1; 
  60.         }
  61.     }
  62.  
  63.     int i=1;
  64.     while(i<1440){
  65.         y[i] = y[i] + y[i-1];
  66.         i++;
  67.     }
  68.  
  69.     int c = 0 ; int g = 0 ; 
  70.     for(int i=0;i<1440;i++){
  71.         if(y[i]==0){
  72.             c++;
  73.             if(c==k)
  74.             {
  75.                 ck(i-k+1);
  76.                 g = 1 ; 
  77.                 break ; 
  78.             }
  79.         }
  80.         else{
  81.             c = 0 ; 
  82.         }
  83.     }
  84.  
  85.     if(g==0){
  86.         cout<<"-1";
  87.     }
  88. }
Success #stdin #stdout 0s 5328KB
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https://ideone.com/0Uq3Ah
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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