Compilare: user.cpp: In function ‘int extend(int, int)’: user.cpp:22:22: warning: unused variable ‘val’ [-Wunused-variable] int _max = 1, k, val; ^ user.cpp: In function ‘int main()’: user.cpp:34:22: warning: unused variable ‘val’ [-Wunused-variable] int n, _max = 0, val, i, j, x, y; ^ user.cpp:59:18: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (s[x][y] != 1) ^ user.cpp:59:18: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized]