View Compilation Error

0_0_19650193_20730.cpp: In function 'int main()':
0_0_19650193_20730.cpp:42:12: error: 'cin' was not declared in this scope
     while (cin>>n>>m>>t)
            ^
0_0_19650193_20730.cpp:70:13: error: 'cout' was not declared in this scope
             cout<<"NO"<<endl;
             ^
0_0_19650193_20730.cpp:70:25: error: 'endl' was not declared in this scope
             cout<<"NO"<<endl;
                         ^
0_0_19650193_20730.cpp:75:13: error: 'cout' was not declared in this scope
             cout<<"YES"<<endl;
             ^
0_0_19650193_20730.cpp:75:26: error: 'endl' was not declared in this scope
             cout<<"YES"<<endl;
                          ^
0_0_19650193_20730.cpp:77:13: error: 'cout' was not declared in this scope
             cout<<"NO"<<endl;
             ^
0_0_19650193_20730.cpp:77:25: error: 'endl' was not declared in this scope
             cout<<"NO"<<endl;
                         ^