View Compilation Error

0_0_14811223_6890.cpp: In function 'void Union(int, int)':
0_0_14811223_6890.cpp:30:10: error: 'qRoot' was not declared in this scope
     city[qRoot] = pRoot;
          ^
0_0_14811223_6890.cpp:30:19: error: 'pRoot' was not declared in this scope
     city[qRoot] = pRoot;
                   ^