Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[s].size();++i) ^ user.cpp:21:21: warning: value computed is not used [-Wunused-value] Max < S[a[s][i]]; ^ user.cpp: In function ‘int main()’: user.cpp:38:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^