human
I found an interesting problem on https://codeforces.com/problemset/problem/292/E:
We often have to copy large volumes of information. Such operation can take up many computer resources. Therefore, in this problem you are advised to come up with a way to copy some part of a number array into another one, quickly.

More formally, you've got two arrays of integers a_1, a_2, ..., a_{n} and b_1, b_2, ..., b_{n} of length n. Also, you've got m queries of two types:  Copy the subsegment of array a of length k, starting from position x, into array b, starting from position y, that is, execute b_{y} + q = a_{x} + q for all integer q (0 ≤ q < k). The given operation is correct — both subsegments do not touch unexistent elements.  Determine the value in position x of array b, that is, find value b_{x}. 

For each query of the second type print the result — the value of the corresponding element of array b.

-----Input-----

The first line contains two space-separated integers n and m (1 ≤ n, m ≤ 10^5) — the number of elements in the arrays and the number of queries, correspondingly. The second line contains an array of integers a_1, a_2, ..., a_{n} (|a_{i}| ≤ 10^9). The third line contains an array of integers b_1, b_2, ..., b_{n} (|b_{i}| ≤ 10^9).

Next m lines contain the descriptions of the queries. The i-th line first contains integer t_{i} — the type of the i-th query (1 ≤ t_{i} ≤ 2). If t_{i} = 1, then the i-th query means the copying operation. If t_{i} = 2, then the i-th query means taking the value in array b. If t_{i} = 1, then the query type is followed by three integers x_{i}, y_{i}, k_{i} (1 ≤ x_{i}, y_{i}, k_{i} ≤ n) — the parameters of the copying query. If t_{i} = 2, then the query type is followed by integer x_{i} (1 ≤ x_{i} ≤ n) — the position in array b.

All numbers in the lines are separated with single spaces. It is guaranteed that all the queries are correct, that is, the copying borders fit into the borders of arrays a and b.

-----Output-----

For each second type query print the result on a single line.

-----Examples-----
Input
5 10
1 2 0 -1 3
3 1 5 -2 0
2 5
1 3 3 3
2...

I tried it in Python, but could not do it. Can you solve it?

=====
What is a Python code to find value b_{x}?
assistant
#Here is Python code to find value b_{x}.

import sys
'''
SEGMENT TREE
Assign
'''
class SegmTree():
    '''
    - modify elements on interval
    - get single element
    '''
    def __init__(self, size):
        N = 1
        while N < size:
            N <<= 1
        self.N = N
        self.tree = [0] * (2*N)

    def modify_range(self, l, r, value):
        l += self.N
        r += self.N
        while l < r:
            if l & 1:
                self.tree[l] = value
                l += 1
            if r & 1:
                r -= 1
                self.tree[r] = value
            l >>= 1
            r >>= 1
    
    def query(self, i):
        i += self.N
        latest_change = self.tree[i]
        p = i
        while p > 1:
            p >>= 1
            latest_change = max(latest_change, self.tree[p])
        return latest_change

# inf = open('input.txt', 'r')
# reader = (map(int, line.split()) for line in inf)
reader = (list(map(int, line.split())) for line in sys.stdin)
input = reader.__next__

n, m = input()
a = list(input())
b = list(input())
st = SegmTree(n)
request = [None] * (m + 1)
for i in range(1, m+1):
    t, *arg = input()
    if t == 1:
        x, y, k = request[i] = arg
        st.modify_range(y-1, y-1+k, i)
    else:
        pos = arg[0] - 1
        req_id = st.query(pos)
        if req_id > 0:
            x, y, k = request[req_id]
            ans = a[x+(pos-y)]
        else:
            ans = b[pos]
        sys.stdout.write(f'{ans}\n')

# inf.close()