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  1. #include <iostream>
  2. //#include <fstream>
  3. #include <sstream>
  4. #include <string>
  5. #include <stack>
  6. using namespace std;
  7.  
  8. struct Stack {
  9. 	void solution(const char *input_path, const char *output_path);
  10. };
  11.  
  12. void Stack::solution(const char *input_path, const char *output_path) {
  13.  
  14.     /*
  15.     ifstream inputFile (input_path);
  16.     ofstream outputFile (output_path);
  17.  
  18.     if (!inputFile.is_open() || !outputFile.is_open()) {
  19.         return;
  20.     }
  21. 	*/
  22.  
  23.     istream &inputFile = cin;
  24.     ostream &outputFile = cout;
  25.  
  26.     stack<int> stk;
  27.     string line; 
  28.  
  29.     while (getline (inputFile, line)) {
  30.         istringstream iss (line);
  31.         char cmd;
  32.  
  33.         if (!(iss >> cmd)) {
  34.             continue;
  35.         }
  36.  
  37.         switch (cmd) {
  38.             case 's': {
  39.                 stk = stack<int>();
  40.                 // alternatively:
  41.                 // stack<int>().swap(stk);
  42.                 break;
  43.             }
  44.  
  45.             case 'u': {
  46.                 int value;
  47.                 if (iss >> value) { 
  48.                     stk.push(value);
  49.                 }
  50.                 break;
  51.             }
  52.  
  53.             case 'o': {
  54.                 if (!stk.empty()) {
  55.                     outputFile << stk.top() << '\n';
  56.                     stk.pop();
  57.                 }
  58.                 break;
  59.             }
  60.         }
  61.     }
  62. }
  63.  
  64. int main() {
  65. 	Stack s;
  66. 	s.solution("", "");
  67. }
Success #stdin #stdout 0s 4904KB
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s
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https://ideone.com/19d7kD
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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