View Compilation Error

0_0_30327568_11420.cpp: In function 'int main()':
0_0_30327568_11420.cpp:15:11: error: 'cin' was not declared in this scope
     while(cin>>n&&n)
           ^
0_0_30327568_11420.cpp:23:25: error: 'cout' was not declared in this scope
         if(n==1&&c[0]) {cout<<"0.000000\n";continue;}
                         ^
0_0_30327568_11420.cpp:24:26: error: 'cout' was not declared in this scope
         if(n==1&&!c[0]) {cout<<"No Solution\n";continue;}
                          ^
0_0_30327568_11420.cpp:25:20: error: 'cout' was not declared in this scope
         if(cnt<2) {cout<<"No Solution\n";continue;}
                    ^
0_0_30327568_11420.cpp:54:9: error: 'cout' was not declared in this scope
         cout<<s[m-1]<<endl;
         ^
0_0_30327568_11420.cpp:54:23: error: 'endl' was not declared in this scope
         cout<<s[m-1]<<endl;
                       ^