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  1. #include <iostream>
  2. #include <queue>
  3. #include <string.h>
  4. using namespace std;
  5.  
  6. int main() {
  7.     std::ios::sync_with_stdio(false);
  8.     int N, i, var;
  9.     char command[5];
  10.  
  11.     queue<int> Queue;
  12.     cin >> N;
  13.     for(i=0; i<N; i++) {
  14.         cin >> command;
  15.         if(!strcmp("push", command)) {
  16.             cin >> var;
  17.             Queue.push(var);
  18.         } else if(!strcmp("pop", command)) {
  19.             if(Queue.size()<1)
  20.                 cout <<"-1\n";
  21.             else {
  22.                 cout << Queue.front() <<"\n";
  23.                 Queue.pop();
  24.             }
  25.  
  26.         } else if(!strcmp("size", command)) {
  27.             cout << Queue.size() <<"\n";
  28.             Queue.size();
  29.  
  30.         } else if(!strcmp("empty", command)) {
  31.             cout << Queue.empty() <<"\n";
  32.  
  33.         } else if(!strcmp("front", command)) {
  34.             if(Queue.size()<1)
  35.                 cout <<"-1\n";
  36.             else
  37.                 cout << Queue.front() << "\n";
  38.  
  39.         } else if(!strcmp("back", command)) {
  40.             if(Queue.size()<1)
  41.                 cout <<"-1\n";
  42.             else
  43.                 cout << Queue.back() <<"\n";
  44.  
  45.         }
  46.  
  47.     }
  48.     return 0;
  49. }
  50.  
Success #stdin #stdout 0s 4392KB
comments (?)
stdin
copy 
15
push 1
push 2
front
back
size
empty
pop
pop
pop
size
empty
pop
push 3
empty
front
stdout
copy 
1
2
2
0
1
2
-1
0
1
-1
0
3
https://ideone.com/UvTcWK
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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