Xor sum

import sys 
import math
input_d = sys.stdin.read().split()

n = int(input_d[0])
q = int(input_d[1])

vals = [int(i) for i in input_d[2:n+2]]
queries = []
i = n+2
for k in range(i,len(input_d),2):
    queries.append([int(i) for i in input_d[k:k+2]])

nn = 2**(math.ceil(math.log2(n))) if n>0 else 1  #next power of two to handle cases where $n$ is not a power of two
tree = [0]*(2*nn+1)

#gotta handle if n is not a power of two

#first original elements
for i in range(nn):
    tree[nn+i] = vals[i]

for i in range(nn-1,0,-1):
    tree[i] = tree[2*i] ^ tree[2*i+1]


def update(k,x):
    k += nn 
    tree[k]=x #replace value
    k//=2
    while(k>=1):
        tree[k] = tree[2*k] ^ tree[2*k+1]
        k//=2
def getxor(a,b):
    a+=nn
    b+=nn 
    res = 0

    while(a<=b):
        if a%2 == 1:
            res = res ^ tree[a]
            a+=1
        if b %2==0:
            res = res ^ tree[b]
            b-=1
        a//=2
        b//=2
    print(res)
    return res


for query in queries:
    getxor(query[0]-1,query[1]-1)

    

Test 1

Verdict: ACCEPTED

Test 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "/box/input/code.py", line 23, in <module>
    tree[nn+i] = vals[i]
IndexError: list index out of range