Compilare: user.cpp: In function ‘int Find(int)’: user.cpp:35:10: warning: statement has no effect [-Wunused-value] for(x; gr[x] != x; x = gr[x]); ^ user.cpp: In function ‘int main()’: user.cpp:82:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); ++j) ^