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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23.  
  24.  
  25.  
  26. vector<string> events;
  27.  
  28. string formatTime(int time){
  29. 	string hr = time/60 < 10 ? "0" + to_string(time/60) : to_string(time/60);
  30.     string min = time%60 < 10 ? "0" +  to_string(time%60) : to_string(time%60);
  31.  
  32.     return hr + ":" + min;
  33. }
  34.  
  35. void  consistency(int n, int k) {
  36. 	int m = 1440;
  37.  
  38. 	vector<int> dif(m, 0);
  39.  
  40. 	for(auto& e : events){
  41. 		stringstream str(e);
  42. 		string name, action, start, end;
  43. 		str >> name >> action >> start >> end;
  44.  
  45. 		string startHr = start.substr(0, 2);
  46. 		string startMin = start.substr(3);
  47. 		string endHr = end.substr(0, 2);
  48. 		string endMin = end.substr(3);
  49.  
  50. 		int startTime = stoi(startHr)*60 + stoi(startMin);
  51. 		int endTime = stoi(endHr)*60 + stoi(endMin);
  52.  
  53. 		dif[startTime]++;
  54. 		if(endTime+1<m) dif[endTime+1]--;
  55. 	}
  56.  
  57. 	for(int i=1; i<m; i++){
  58. 		dif[i] += dif[i-1];
  59. 	}
  60.  
  61.  
  62. 	int last = -1;
  63. 	for(int i=0; i<m; i++){
  64.  
  65. 		if(dif[i] == 0 ){
  66. 			if(i-last >= k){
  67. 				cout << formatTime(last+1) << endl;
  68. 				return;
  69. 			}
  70.  
  71. 		}
  72. 		else last = i;
  73. 	}
  74.  
  75.  
  76. 	cout << -1 << endl;
  77.  
  78.  
  79. }
  80.  
  81. void solve() {
  82.  
  83. 	int n, k;
  84.     cin >> n  >> k;
  85.  
  86.     cin.ignore();
  87.     events.resize(n); 
  88.     for(int i=0; i<n; i++){
  89. 		string line;
  90.     	getline(cin, line);
  91.  
  92.     	events[i] = line;
  93.     }
  94.  
  95. 	consistency(n, k);
  96. }
  97.  
  98.  
  99.  
  100.  
  101.  
  102. int32_t main() {
  103.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  104.  
  105.     int t = 1;
  106.     cin >> t;
  107.  
  108.     cin.ignore(); 
  109.  
  110.     while (t--) {
  111.         solve();
  112.     }
  113.  
  114.     return 0;
  115. }
Success #stdin #stdout 0.01s 5288KB
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sam sleep 12:00 23:59
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https://ideone.com/LiCUzC
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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