Compilare: user.cpp: In function ‘int sum(int)’: user.cpp:24:12: warning: ‘S’ may be used uninitialized in this function [-Wmaybe-uninitialized] return S; ^ user.cpp: In function ‘int main()’: user.cpp:45:28: warning: ‘S’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<sum(v)-sum(t)<<'\n'; ^ user.cpp:45:28: warning: ‘S’ may be used uninitialized in this function [-Wmaybe-uninitialized]