View Compilation Error

0_0_29610271_14312.cpp: In function 'int main()':
0_0_29610271_14312.cpp:39:11: error: 'cin' was not declared in this scope
     while(cin>>n>>m)
           ^
0_0_29610271_14312.cpp:56:13: error: 'cout' was not declared in this scope
             cout<<"-1"<<endl;
             ^
0_0_29610271_14312.cpp:56:25: error: 'endl' was not declared in this scope
             cout<<"-1"<<endl;
                         ^
0_0_29610271_14312.cpp:58:13: error: 'cout' was not declared in this scope
             cout<<dis[T]<<endl;
             ^
0_0_29610271_14312.cpp:58:27: error: 'endl' was not declared in this scope
             cout<<dis[T]<<endl;
                           ^