Compilare: user.cpp: In function ‘bool valid(int, int)’: user.cpp:18:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[v[k-1]].size(); i++) ^ user.cpp: In function ‘bool exita_leg(int, int)’: user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:80:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) ^