Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lst[x].size(); ++i) ^ user.cpp:37:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < lst[x].size(); ++j) ^ user.cpp:59:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int cnf = 0; cnf < msk[sz1].size(); ++cnf) { ^ user.cpp: In function ‘int main()’: user.cpp:129:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lst[i].size(); ++j) ^