Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:57:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[x].size(); i++) ^ user.cpp: In function ‘void afisare()’: user.cpp:78:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); i++) ^ user.cpp:80:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sol[i].size(); j++) ^