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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4. #include <string>
  5.  
  6. using namespace std;
  7.  
  8. vector<int> v;
  9.  
  10. int main() {
  11. 	ios_base::sync_with_stdio(false);
  12. 	cin.tie(NULL);
  13.  
  14. 	vector<int> v;
  15.  
  16. 	int N;
  17. 	cin >> N;
  18. 	string input;
  19. 	getchar();
  20. 	for (int i = 0; i < N; i++) {
  21. 		getline(cin, input);
  22. 		string command = input.substr(0, input.find(' '));
  23. 		if (command == "push") {
  24. 			v.push_back(stoi((input.substr(input.find(' ') + 1, -1))));
  25. 		}
  26. 		else if (command == "pop") {
  27. 			if (v.size() == 0) {
  28. 				cout << "-1" << '\n';
  29. 			}
  30. 			else {
  31. 				cout << v[v.size()-1] << '\n';
  32. 				v.pop_back();
  33. 			}
  34. 		}
  35. 		else if (command == "size") {
  36. 			cout << v.size() << '\n';
  37. 		}
  38. 		else if (command == "empty") {
  39. 			if (v.size() == 0)
  40. 				cout << "1" << '\n';
  41. 			else
  42. 				cout << "0" << '\n';
  43. 		}
  44. 		else {
  45. 			if (v.size() == 0)
  46. 				cout << "-1" << '\n';
  47. 			else
  48. 				cout << v[v.size()-1] << '\n';
  49. 		}
  50. 	}
  51.  
  52. 	return 0;
  53. }
Success #stdin #stdout 0s 4388KB
comments (?)
stdin
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7
pop
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push 123
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pop
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stdout
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-1
-1
-1
123
123
-1
https://ideone.com/4Mu1m7
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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