View Compilation Error

0_0_20068859_25619.cpp: In function 'void dfs(int, int, int, int)':
0_0_20068859_25619.cpp:21:3: error: 'cout' was not declared in this scope
   cout<<"YES"<<endl;
   ^
0_0_20068859_25619.cpp:21:16: error: 'endl' was not declared in this scope
   cout<<"YES"<<endl;
                ^
0_0_20068859_25619.cpp: In function 'int main()':
0_0_20068859_25619.cpp:72:8: error: 'cin' was not declared in this scope
  while(cin>>m>>n,m+n)
        ^
0_0_20068859_25619.cpp:78:25: error: 'scanf' was not declared in this scope
    scanf("%d",&map[i][j]);
                         ^
0_0_20068859_25619.cpp:93:5: error: 'cout' was not declared in this scope
     cout<<"NO"<<endl;
     ^
0_0_20068859_25619.cpp:93:17: error: 'endl' was not declared in this scope
     cout<<"NO"<<endl;
                 ^
0_0_20068859_25619.cpp:114:13: error: 'cout' was not declared in this scope
    if(!flag)cout<<"NO"<<endl; 
             ^
0_0_20068859_25619.cpp:114:25: error: 'endl' was not declared in this scope
    if(!flag)cout<<"NO"<<endl; 
                         ^