Compilare: user.cpp: In function ‘int main()’: user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:21:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=g[i];j<=gr;j++) ^ user.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=gr;j++) ^