View Compilation Error

0_0_22293102_6844.cpp: In function 'll change(int, int, ll, ll)':
0_0_22293102_6844.cpp:154:19: error: 'u' was not declared in this scope
     int tp1 = top[u],tp2 = top[v];
                   ^
0_0_22293102_6844.cpp:156:16: error: 'tp2' was not declared in this scope
     while(tp1!=tp2){
                ^
0_0_22293102_6844.cpp:159:20: error: 'v' was not declared in this scope
             swap(u,v);
                    ^