Compilare: user.cpp: In function ‘bool dfs(int)’: user.cpp:16:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[knot].size(); i ++) { ^ user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[knot].size(); i ++) { ^ user.cpp: In function ‘void suport(int)’: user.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[knot].size(); i ++) { ^