Compilare: user.cpp: In function ‘void citire()’: user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) {f>>a[i];sumi+=(long long )a[i];} ^ user.cpp: In function ‘void solve_f3()’: user.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n-2;i++) ^ user.cpp: In function ‘void solve_f2()’: user.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=n-1;j++) ^