Compilare: user.cpp: In function ‘void Solve()’: user.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:12:12: warning: unused variable ‘y’ [-Wunused-variable] { int x,y,i; ^ user.cpp: In function ‘int main()’: user.cpp:60:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(p=0;p<v[x].size();p++) ^ user.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) ^