Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:38:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lst[x].size(); ++i) ^ user.cpp:39:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < lst[x].size(); ++j) ^ user.cpp:69:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int cnf = 0; cnf < msk[sz1].size(); ++cnf) { ^