Buggy python submission (verdict: Time Limit Exceeded):

N, K = map(int, input().split())
a = [int(x) for x in input().split()]

beautifuls = []
for i in range(0, len(a)):
    for j in range(i+1, len(a)+1):
        beautiful = sum(a[i:j])
        beautifuls.append(beautiful)

x_ = 0
t = 40
count = 0
while 1:
    for i in range(len(beautifuls)):
        if eval(str(bin((x_ + 2**(t-1)) & beautifuls[i]))) == x_+ 2**(t-1):
            count += 1
            if count == K:
                x_ += 2**(t-1)
                t = 40
                break
    count = 0
    t -= 1
    if t == 0:
        break

print(x_)


Fixed submission:
import sys, re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians
from itertools import accumulate, permutations, combinations, product, groupby
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from fractions import gcd
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
def ZIP(n): return zip(*(MAP() for _ in range(n)))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7

N, K = MAP()
a = LIST()

l = []

for i in range(1, N+1):
	tmp = sum(a[:i])
	for j in range(N-i+1):
		l.append(tmp)
		tmp -= a[j]
		if j+i <= N-1:
			tmp += a[j+i]

ans = 0
for i in range(max(l).bit_length()-1, -1, -1):
	nextl = []
	for x in l:
		if (x>>i)&1:
			nextl.append(x)
	if len(nextl) >= K:
		ans += 1<<i
		l = nextl
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):

N, K = map(int, input().split())
a = [int(x) for x in input().split()]

beautifuls = []
for i in range(0, len(a)):
    for j in range(i+1, len(a)+1):
        beautiful = sum(a[i:j])
        beautifuls.append(beautiful)

x_ = 0
t = 1
count = 0
while 1:
    for i in range(len(beautifuls)):
        if eval(str(bin((x_ + 2**(t-1)) & beautifuls[i]))) == x_+ 2**(t-1):
            count += 1
            if count == K:
                x_ += 2**(t-1)
                t = 0
                break
    count = 0
    t += 1
    if t > 40:
        break

print(x_)


Fixed submission:
import sys, re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians
from itertools import accumulate, permutations, combinations, product, groupby
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from fractions import gcd
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
def ZIP(n): return zip(*(MAP() for _ in range(n)))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7

N, K = MAP()
a = LIST()

l = []

for i in range(1, N+1):
	tmp = sum(a[:i])
	for j in range(N-i+1):
		l.append(tmp)
		tmp -= a[j]
		if j+i <= N-1:
			tmp += a[j+i]

ans = 0
for i in range(max(l).bit_length()-1, -1, -1):
	nextl = []
	for x in l:
		if (x>>i)&1:
			nextl.append(x)
	if len(nextl) >= K:
		ans += 1<<i
		l = nextl
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import itertools as tool

N, K = map(int, input().split())
a = [int(x) for x in input().split()]

beautifuls = []
for i in range(0, len(a)):
    for j in range(i+1, len(a)+1):
        beautiful = sum(a[i:j])
        beautifuls.append(beautiful)

beau_K = list(tool.combinations(beautifuls, K))
ands = []
for combi in beau_K:
    for i in range(K):
        if i == 0:
            tmp = combi[0]
        else:
            tmp = eval(str(bin(tmp & combi[i])))
    ands.append(eval(str(tmp)))
print(max(ands))


Fixed submission:
import sys, re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians
from itertools import accumulate, permutations, combinations, product, groupby
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from fractions import gcd
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
def ZIP(n): return zip(*(MAP() for _ in range(n)))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7

N, K = MAP()
a = LIST()

l = []

for i in range(1, N+1):
	tmp = sum(a[:i])
	for j in range(N-i+1):
		l.append(tmp)
		tmp -= a[j]
		if j+i <= N-1:
			tmp += a[j+i]

ans = 0
for i in range(max(l).bit_length()-1, -1, -1):
	nextl = []
	for x in l:
		if (x>>i)&1:
			nextl.append(x)
	if len(nextl) >= K:
		ans += 1<<i
		l = nextl
print(ans)

Buggy python submission (verdict: Runtime Error):
import itertools as tool

N, K = map(int, input().split())
a = [int(x) for x in input().split()]

beautifuls = []
for i in range(0, len(a)):
    for j in range(i+1, len(a)+1):
        beautiful = sum(a[i:j])
        beautifuls.append(beautiful)

beau_K = list(tool.combinations(beautifuls, K))
ands = []
for combi in beau_K:
    for i in range(K):
        if i == 0:
            tmp = combi[0]
        else:
            tmp = bin(tmp & combi[i])
    ands.append(eval(str(tmp)))
print(max(ands))


Fixed submission:
import sys, re
from collections import deque, defaultdict, Counter
from math import ceil, sqrt, hypot, factorial, pi, sin, cos, radians
from itertools import accumulate, permutations, combinations, product, groupby
from operator import itemgetter, mul
from copy import deepcopy
from string import ascii_lowercase, ascii_uppercase, digits
from bisect import bisect, bisect_left
from fractions import gcd
from heapq import heappush, heappop
from functools import reduce
def input(): return sys.stdin.readline().strip()
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))
def ZIP(n): return zip(*(MAP() for _ in range(n)))
sys.setrecursionlimit(10 ** 9)
INF = float('inf')
mod = 10 ** 9 + 7

N, K = MAP()
a = LIST()

l = []

for i in range(1, N+1):
	tmp = sum(a[:i])
	for j in range(N-i+1):
		l.append(tmp)
		tmp -= a[j]
		if j+i <= N-1:
			tmp += a[j+i]

ans = 0
for i in range(max(l).bit_length()-1, -1, -1):
	nextl = []
	for x in l:
		if (x>>i)&1:
			nextl.append(x)
	if len(nextl) >= K:
		ans += 1<<i
		l = nextl
print(ans)