Compilare: user.cpp: In function ‘void Border()’: user.cpp:50:34: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a[i][0]=b[i][0]=a[i][m+1]=b[i][m+1]=-1; ^ user.cpp:50:16: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a[i][0]=b[i][0]=a[i][m+1]=b[i][m+1]=-1; ^ user.cpp:53:36: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a[n+1][i]=b[n+1][i]=a[0][i]=b[0][i]=-1; ^ user.cpp:53:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a[n+1][i]=b[n+1][i]=a[0][i]=b[0][i]=-1; ^