View Compilation Error

0_0_36552926_15991.cpp: In function 'int main()':
0_0_36552926_15991.cpp:12:76: error: 'yes' was not declared in this scope
         if( sum <= maxn*(n-1) + minn && sum >= minn*(n-1) + maxn ) cout << yes << endl;
                                                                            ^
0_0_36552926_15991.cpp:13:22: error: 'no' was not declared in this scope
         else cout << no << endl;
                      ^