using System;
public class Test
{
public static bool Func(int a, int b)
{
return (a -= -b) == (a += b);
}
public static void Main()
{
for (int a = 0; a <= 10; ++a)
for (int b = 0; b <= 10; ++b)
if (Func(a, b))
Console.WriteLine($"{a}, {b}");
}
}
dXNpbmcgU3lzdGVtOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyBib29sIEZ1bmMoaW50IGEsIGludCBiKQoJewoJCXJldHVybiAoYSAtPSAtYikgPT0gKGEgKz0gYik7Cgl9CgkKCXB1YmxpYyBzdGF0aWMgdm9pZCBNYWluKCkKCXsKCQlmb3IgKGludCBhID0gMDsgYSA8PSAxMDsgKythKQoJICAgIAlmb3IgKGludCBiID0gMDsgYiA8PSAxMDsgKytiKQoJICAgIAkJaWYgKEZ1bmMoYSwgYikpCgkgICAgCQkJQ29uc29sZS5Xcml0ZUxpbmUoJCJ7YX0sIHtifSIpOwoJfQp9Cg==
0, 0
1, 0
2, 0
3, 0
4, 0
5, 0
6, 0
7, 0
8, 0
9, 0
10, 0