Buggy python submission (verdict: Runtime Error):
from fractions import gcd
from datetime import date, timedelta
from heapq import*
import math
from collections import defaultdict, Counter, deque
import sys
from bisect import *
import itertools
import copy
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7


def main():
    n, k = map(int, input().split())
    a = list(map(int, input().split()))
    
    rui = [a[0]]
    for i in range(1, n):
        rui.append(rui[i - 1] + a[i])
    rui = [0] + rui
    ansl = []
    for i in range(n):
        for j in range(i,n):
            ansl.append(rui[j + 1] - rui[i])
    ansl = sorted(ansl, reverse=True)
    
    cnt = 0
    anscnt = 0
    ansbit = 0
    L = []
    for i in range(50):
        bit = (1 << (50 - i))
        l = []
        for j in range(len(ansl)):
            if ansl[j] & bit == 0:
                l.append(ansl[j])
            else:
                L.append(ansl[j])
                #ans &= ansl[j]
                cnt += 1
        if cnt >= k:
            ansbit = i
            break
        else:
            anscnt += len(L)
            for j in range(len(L)):
                ans &= L[j]
            L = []
        ansl = l

    ans = 0
    for i in range(ansbit,50):
        bit = (1 << (50 - i))
        LL = []
        cnt = 0
        for j in range(len(L)):
            if L[j] & bit == 0:
                l.append(L[j])
            else:
                cnt+=1
                #LL.append(L[j])

        if cnt >= k:
            #L = LL
            ans |= bit
                

    
    print(ans)
    
                    


if __name__ == '__main__':
    main()


Fixed submission:
from fractions import gcd
from datetime import date, timedelta
from heapq import*
import math
from collections import defaultdict, Counter, deque
import sys
from bisect import *
import itertools
import copy
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7


def main():
    n, k = map(int, input().split())
    a = list(map(int, input().split()))
    
    rui = [a[0]]
    for i in range(1, n):
        rui.append(rui[i - 1] + a[i])
    rui = [0] + rui
    ansl = []
    for i in range(n):
        for j in range(i,n):
            ansl.append(rui[j + 1] - rui[i])
    ansl = sorted(ansl, reverse=True)
    
    cnt = 0
    ansbit = 0
    L = []
    for i in range(51):
        bit = (1 << (50 - i))
        l = []
        for j in range(len(ansl)):
            if ansl[j] & bit == 0:
                l.append(ansl[j])
            else:
                L.append(ansl[j])
                cnt += 1
        if cnt >= k:
            ansbit = i
            break
        else:
            L = []
        # ansl = l

    ans = 0
    for i in range(51):
        bit = (1 << (50 - i))
        LL = []
        cnt = 0
        for j in range(len(L)):
            if L[j] & bit != 0:
                cnt+=1
                LL.append(L[j])

        if cnt >= k:
            L = LL
            ans |= bit

        if len(L) < k:
            break
                

    
    print(ans)
    
                    


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
from fractions import gcd
from datetime import date, timedelta
from heapq import*
import math
from collections import defaultdict, Counter, deque
import sys
from bisect import *
import itertools
import copy
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7


def main():
    n, k = map(int, input().split())
    a = list(map(int, input().split()))
    
    rui = [a[0]]
    for i in range(1, n):
        rui.append(rui[i - 1] + a[i])
    rui = [0] + rui
    ansl = []
    for i in range(n):
        for j in range(i,n):
            ansl.append(rui[j + 1] - rui[i])
    ansl = sorted(ansl, reverse=True)
    
    cnt = 0
    anscnt = 0
    ansbit = 0
    L = []
    for i in range(50):
        bit = (1 << (50 - i))
        l = []
        for j in range(len(ansl)):
            if ansl[j] & bit == 0:
                l.append(ansl[j])
            else:
                L.append(ansl[j])
                #ans &= ansl[j]
                cnt += 1
        if cnt >= k:
            ansbit = i
            break
        else:
            anscnt += len(L)
            for j in range(len(L)):
                ans &= L[j]
            L = []
        ansl = l

    ans = 0
    for i in range(ansbit,50):
        bit = (1 << (50 - i))
        LL = []
        cnt = 0
        for j in range(len(L)):
            if L[j] & bit == 0:
                l.append(L[j])
            else:
                cnt+=1
                LL.append(L[j])

        if cnt >= k:
            L = LL
            ans |= bit
                

    
    print(ans)
    
                    


if __name__ == '__main__':
    main()


Fixed submission:
from fractions import gcd
from datetime import date, timedelta
from heapq import*
import math
from collections import defaultdict, Counter, deque
import sys
from bisect import *
import itertools
import copy
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7


def main():
    n, k = map(int, input().split())
    a = list(map(int, input().split()))
    
    rui = [a[0]]
    for i in range(1, n):
        rui.append(rui[i - 1] + a[i])
    rui = [0] + rui
    ansl = []
    for i in range(n):
        for j in range(i,n):
            ansl.append(rui[j + 1] - rui[i])
    ansl = sorted(ansl, reverse=True)
    
    cnt = 0
    ansbit = 0
    L = []
    for i in range(51):
        bit = (1 << (50 - i))
        l = []
        for j in range(len(ansl)):
            if ansl[j] & bit == 0:
                l.append(ansl[j])
            else:
                L.append(ansl[j])
                cnt += 1
        if cnt >= k:
            ansbit = i
            break
        else:
            L = []
        # ansl = l

    ans = 0
    for i in range(51):
        bit = (1 << (50 - i))
        LL = []
        cnt = 0
        for j in range(len(L)):
            if L[j] & bit != 0:
                cnt+=1
                LL.append(L[j])

        if cnt >= k:
            L = LL
            ans |= bit

        if len(L) < k:
            break
                

    
    print(ans)
    
                    


if __name__ == '__main__':
    main()