2043F - Nim. Nah, I've forgotten the dp way for finding xor = 0, and I wrote meet in the middle, because we can remove all the elements except for 7. So I can test if I can leave exactly 1 element, 2 elements, ..., 6 elements. And to check if I can leave 6 elements, I can check a pair of (3, 3) elements. 298456482
2043F - Nim. Nah, I've forgotten the dp way for finding xor = 0, and I wrote meet in the middle, because we can remove all the elements except for 7. So I can test if I can leave exactly 1 element, 2 elements, ..., 6 elements. And to check if I can leave 6 elements, I can check a pair of (3, 3) elements. 298456482