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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     ios_base :: sync_with_stdio(false);
  7.     cin.tie(NULL);
  8.     cout.tie(NULL);
  9.     vector <int> v;
  10.     int n;
  11.     int si = 0;
  12.     cin >> n;
  13.     cin.ignore();
  14.     while(n--)
  15.     {
  16.         string s;
  17.         cin >> s;
  18.         if(s == "push")
  19.         {
  20.             int l;
  21.             cin >> l;
  22.             v.push_back(l);
  23.             si++;
  24.         }
  25.         else if(s == "pop")
  26.         {
  27.             if(si == 0)
  28.             {
  29.                 cout << -1 << '\n';
  30.                 continue;
  31.             }
  32.             cout << v[0] << '\n';
  33.             swap(v[si - 1], v[0]);
  34.             v.pop_back();
  35.             si--;
  36.         }
  37.         else if(s == "size")
  38.         {
  39.             cout << si << '\n';
  40.         }
  41.         else if(s == "empty")
  42.         {
  43.             if(si == 0) cout << 1 << '\n';
  44.             else cout << 0 << '\n';
  45.         }
  46.         else if(s == "front")
  47.         {
  48.             if(si == 0)
  49.             {
  50.                 cout << -1 << '\n';
  51.                 continue;
  52.             }
  53.             cout << v[0] << '\n';
  54.         }
  55.         else
  56.         {
  57.             if(si == 0)
  58.             {
  59.                 cout << -1 << '\n';
  60.                 continue;
  61.             }
  62.             cout << v[si - 1] << '\n';
  63.         }
  64.     }
  65.     return 0;
  66. }
Success #stdin #stdout 0.01s 5500KB
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stdin
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5
push 1
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stdout
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https://ideone.com/yD993i
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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