View Compilation Error

0_0_28881512_4624.cpp: In function 'int main()':
0_0_28881512_4624.cpp:39:8: error: 'cin' was not declared in this scope
  while(cin >> n >> m)
        ^
0_0_28881512_4624.cpp:62:21: error: 'cout' was not declared in this scope
   if(dis[end]==INF) cout << "-1";
                     ^
0_0_28881512_4624.cpp:63:8: error: 'cout' was not declared in this scope
   else cout << dis[end] << endl;
        ^
0_0_28881512_4624.cpp:63:28: error: 'endl' was not declared in this scope
   else cout << dis[end] << endl;
                            ^