Buggy python submission (verdict: Time Limit Exceeded):
import math

N, K = map(int, input().split(" "))
# A = list(map(minus_one, list(map(int, input().split(" ")))))

doubling_table = [list(map(lambda n: n - 1, list(map(int, input().split(" ")))))]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K, city = K - 2 ** i, doubling_table[i][city] 
#         city = doubling_table[i][city]
        
print(city + 1)

Fixed submission:
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
A = list(map(int, input().split(" ")))
A = list(map(minus_one, A))

doubling_table = [A]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)

Buggy python submission (verdict: Time Limit Exceeded):
import math

N, K = map(int, input().split(" "))
# A = list(map(minus_one, list(map(int, input().split(" ")))))

doubling_table = [list(map(lambda n: n - 1, list(map(int, input().split(" ")))))]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K, city = K - 2 ** i, doubling_table[i][city] 
#         city = doubling_table[i][city]
        
print(city + 1)

Fixed submission:
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
A = list(map(int, input().split(" ")))
A = list(map(minus_one, A))

doubling_table = [A]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)

Buggy python submission (verdict: Time Limit Exceeded):
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
# A = list(map(minus_one, list(map(int, input().split(" ")))))

doubling_table = [list(map(minus_one, list(map(int, input().split(" ")))))]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)

Fixed submission:
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
A = list(map(int, input().split(" ")))
A = list(map(minus_one, A))

doubling_table = [A]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)

Buggy python submission (verdict: Time Limit Exceeded):
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
A = list(map(int, input().split(" ")))
A = list(map(minus_one, A))

doubling_table = [A]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)

Fixed submission:
import math

def minus_one(n):
    return n - 1

N, K = map(int, input().split(" "))
A = list(map(int, input().split(" ")))
A = list(map(minus_one, A))

doubling_table = [A]
for i in range(0,int(math.log2(K))):
    doubling_table.append([doubling_table[i][doubling_table[i][j]] for j in range(0,N)])
#     next_table = [doubling_table[i][doubling_table[i][j]] for j in range(0,N)]
#     doubling_table.append(next_table)
# print(doubling_table)

city = 0
for i in range(int(math.log2(K)), -1, -1):
    if K >= 2 ** i:
        K -= 2 ** i
        city = doubling_table[i][city]
        
print(city + 1)