View Compilation Error

0_0_36543362_29348.cpp: In function 'void solve(int, int, int, int, int)':
0_0_36543362_29348.cpp:50:24: error: 'x' was not declared in this scope
  if(dep[s]>dep[t])swap(x,y);
                        ^
0_0_36543362_29348.cpp:50:26: error: 'y' was not declared in this scope
  if(dep[s]>dep[t])swap(x,y);
                          ^