Buggy python submission (verdict: Runtime Error):
import sys
from collections import *
import heapq
import math
# from math import gcd
import bisect
import copy
from itertools import permutations,accumulate,combinations,product
# def input():
#     return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        # print(i,j)
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log2(rlst[-1])
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)

Fixed submission:
import sys
from collections import *
import heapq
import math
# from math import gcd
import bisect
import copy
from itertools import permutations,accumulate,combinations,product
# def input():
#     return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        # print(i,j)
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log(rlst[-1],2)
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)

Buggy python submission (verdict: Runtime Error):
import sys
from collections import *
import heapq
import math

import bisect
import copy
from itertools import permutations,accumulate,combinations,product
def input():
    return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log2(rlst[-1])
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)

Fixed submission:
import sys
from collections import *
import heapq
import math
# from math import gcd
import bisect
import copy
from itertools import permutations,accumulate,combinations,product
# def input():
#     return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        # print(i,j)
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log(rlst[-1],2)
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)

Buggy python submission (verdict: Runtime Error):
import sys
from collections import *
import heapq
import math
from math import gcd
import bisect
import copy
from itertools import permutations,accumulate,combinations,product
def input():
    return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log2(rlst[-1])
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)

Fixed submission:
import sys
from collections import *
import heapq
import math
# from math import gcd
import bisect
import copy
from itertools import permutations,accumulate,combinations,product
# def input():
#     return sys.stdin.readline()[:-1]
def ruiseki(lst):
    return [0]+list(accumulate(lst))
mod=pow(10,9)+7
al=[chr(ord('a') + i) for i in range(26)]
direction=[[1,0],[0,1],[-1,0],[0,-1]]

n,k=map(int,input().split())
a=list(map(int,input().split()))
rlst=ruiseki(a)
# print(rlst)
lst=[]
for i in range(n+1):
    for j in range(i+1,n+1):
        # print(i,j)
        lst.append(rlst[j]-rlst[i])
# print(lst)
tmp=math.log(rlst[-1],2)
now=int(tmp)

while now>=0:
    anslst=[]
    for i in range(len(lst)):
        if 1&(lst[i]>>now)==1:
            anslst.append(lst[i])
    if len(anslst)>=k:
        lst=anslst
    now-=1
# print(lst)
ans=lst[0]
for i in range(k):
    ans=ans&lst[i]
print(ans)