Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [-1]*(2*n)
for i,c in enumerate(a*2):
    if c in memo: res[memo[c]] = i+1
    memo[c] = i


res2 = res[:n]

"""
def dfs(i):
    if res2[i] < n: res2[i] = dfs(res2[i])
    return res2[i]

for i in range(n): dfs(i)
"""

for i in range(n-1,-1,-1):
    if res2[i] < n: res2[i] = res2[res2[i]]

cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset += 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n


#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)

if ans >= n: exit()
else:
    s = []
    for i in range(ans,n):
        if a[i] not in s:
            s.append(a[i])
        else:
            while a[i] in s: s.pop()
    
print(" ".join(map(str,s)))




Fixed submission:
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [0]*(2*n)
for i,c in enumerate(a*2):
    if c in memo: res[memo[c]] = i+1
    memo[c] = i

#print(res)

res2 = res[:n]

for i in range(n-1,-1,-1):
    if res2[i] < n:
        res2[i] = res2[res2[i]]

cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset = 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n

#print(res2)
#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = cycle[k]
else: exit()
while res[ans] < n:
    ans = res[ans]

"""
if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)
"""


if ans >= n: exit()
else:
    s = []
    ss = set()
    for i in range(ans,n):
        if a[i] in ss:
            while a[i] in ss:
                c = s.pop()
                ss.remove(c)
        else:
            s.append(a[i])
            ss.add(a[i])
    
print(" ".join(map(str,s)))

Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [-1]*(2*n)
for i,c in enumerate(a*2):
    if c in memo:
        res[memo[c]] = i+1
    memo[c] = i


res2 = [0]*(n)

def dfs(i):
    if res[i] < n:
        res2[i] = dfs(res[i])
    else:
        res2[i] = res[i]
    return res2[i]

for i in range(n): dfs(i)
#print(res)        
#print(res2)        


cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset += 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n


#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)

if ans >= n: exit()
else:
    s = []
    for i in range(ans,n):
        ai = str(a[i])
        if ai not in s:
            s.append(ai)
        else:
            while ai in s: s.pop()
    
print(" ".join(s))




Fixed submission:
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [0]*(2*n)
for i,c in enumerate(a*2):
    if c in memo: res[memo[c]] = i+1
    memo[c] = i

#print(res)

res2 = res[:n]

for i in range(n-1,-1,-1):
    if res2[i] < n:
        res2[i] = res2[res2[i]]

cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset = 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n

#print(res2)
#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = cycle[k]
else: exit()
while res[ans] < n:
    ans = res[ans]

"""
if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)
"""


if ans >= n: exit()
else:
    s = []
    ss = set()
    for i in range(ans,n):
        if a[i] in ss:
            while a[i] in ss:
                c = s.pop()
                ss.remove(c)
        else:
            s.append(a[i])
            ss.add(a[i])
    
print(" ".join(map(str,s)))

Buggy python submission (verdict: Time Limit Exceeded):
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [-1]*(2*n)
for i,c in enumerate(a*2):
    if c in memo:
        res[memo[c]] = i+1
    memo[c] = i


res2 = [0]*(n)

def dfs(i):
    if res[i] < n:
        res2[i] = dfs(res[i])
    else:
        res2[i] = res[i]
    return res2[i]

for i in range(n): dfs(i)
#print(res)        
#print(res2)        


cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset += 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n


#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)

if ans >= n: exit()
else:
    s = []
    for i in range(ans,n):
        ai = str(a[i])
        if ai not in s:
            s.append(ai)
        else:
            while ai in s: s.pop()
    
print(" ".join(s))




Fixed submission:
# coding: utf-8
# Your code here!

import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline #文字列入力のときは注意

n,k = [int(i) for i in readline().split()]
a = [int(i) for i in readline().split()]

memo = dict()
res = [0]*(2*n)
for i,c in enumerate(a*2):
    if c in memo: res[memo[c]] = i+1
    memo[c] = i

#print(res)

res2 = res[:n]

for i in range(n-1,-1,-1):
    if res2[i] < n:
        res2[i] = res2[res2[i]]

cycle = [0]
offset = 0
now = res2[0]-n

while now != 0:
    if now == n:
        offset = 1
        break
    else:
        cycle.append(now)
        now = res2[now]-n

#print(res2)
#print(cycle,offset)

l = len(cycle)
k-=1
k %= (l+offset)

#print("k =",k)

if k != l: ans = cycle[k]
else: exit()
while res[ans] < n:
    ans = res[ans]

"""
if k != l: ans = p = cycle[k]
else: ans = p = n+1
while p <= n:
    ans = p
    p = res[p]
#    print(ans,p)
"""


if ans >= n: exit()
else:
    s = []
    ss = set()
    for i in range(ans,n):
        if a[i] in ss:
            while a[i] in ss:
                c = s.pop()
                ss.remove(c)
        else:
            s.append(a[i])
            ss.add(a[i])
    
print(" ".join(map(str,s)))