Submission #61189295

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Source Code Expand

import sys, time, random
from collections import deque, Counter, defaultdict
def debug(*x):print('debug:',*x, file=sys.stderr)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353
import itertools
n, k = mi()

a = li()

if k < n // 2:
    ans = 0
    for V in itertools.combinations(range(n), k):
        cnt = 0
        for j in V:
            cnt ^= a[j]
        ans = max(ans, cnt)
    print(ans)
    
else:
    allxor = 0
    ans = 0
    for i in range(n):
        allxor ^= a[i]
    for V in itertools.combinations(range(n), n - k):
        cnt = 0
        for j in V:
            cnt ^= a[j]
        ans = max(ans, cnt ^ allxor)
    print(ans)
    

Submission Info

Judge Result