Compilare: user.cpp: In function ‘int main()’: user.cpp:12:39: warning: unused variable ‘x1’ [-Wunused-variable] int a[10][10], n, j, i, k, v = 1, x1, y1, x2, y2, s; ^ user.cpp:12:43: warning: unused variable ‘y1’ [-Wunused-variable] int a[10][10], n, j, i, k, v = 1, x1, y1, x2, y2, s; ^ user.cpp:12:47: warning: unused variable ‘x2’ [-Wunused-variable] int a[10][10], n, j, i, k, v = 1, x1, y1, x2, y2, s; ^ user.cpp:12:51: warning: unused variable ‘y2’ [-Wunused-variable] int a[10][10], n, j, i, k, v = 1, x1, y1, x2, y2, s; ^ user.cpp:12:55: warning: unused variable ‘s’ [-Wunused-variable] int a[10][10], n, j, i, k, v = 1, x1, y1, x2, y2, s; ^