Compilare: user.cpp: In function ‘void bkt(int, int)’: user.cpp:22:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[v].size(); i ++) c[L[v][i]][j] = true; ^ user.cpp:24:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[v].size(); i ++) c[L[v][i]][j] = false; ^