Compilare: user.cpp: In function ‘int func(int, int)’: user.cpp:30:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[i-1][y]!=-1) ^ user.cpp:36:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[i+1][y]!=-1) ^ user.cpp:42:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[x][j-1]!=-1) ^ user.cpp:48:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[x][j+1]!=-1) ^