Compilare: user.cpp: In function ‘bool find_ancestor(int)’: user.cpp:15:9: warning: unused variable ‘p’ [-Wunused-variable] int p = lg; ^ user.cpp: In function ‘int main()’: user.cpp:84:57: warning: operation on ‘p’ may be undefined [-Wsequence-point] dp[++p][x] = dp[ p-1 ][ dp[p-1][x] ]; ^ user.cpp:84:57: warning: operation on ‘p’ may be undefined [-Wsequence-point] user.cpp:56:16: warning: unused variable ‘a’ [-Wunused-variable] int op,a,b,x,y; ^ user.cpp:56:18: warning: unused variable ‘b’ [-Wunused-variable] int op,a,b,x,y; ^ user.cpp:37:16: warning: array subscript is below array bounds [-Warray-bounds] nod = dp[pw][nod]; ^