Compilare: user.cpp: In function ‘int main()’: user.cpp:12:21: warning: unused variable ‘val’ [-Wunused-variable] int n, s, i, j, val=0, l, x, y; ^ user.cpp:12:28: warning: unused variable ‘l’ [-Wunused-variable] int n, s, i, j, val=0, l, x, y; ^ user.cpp:12:31: warning: unused variable ‘x’ [-Wunused-variable] int n, s, i, j, val=0, l, x, y; ^ user.cpp:12:34: warning: unused variable ‘y’ [-Wunused-variable] int n, s, i, j, val=0, l, x, y; ^