Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
cycle = 0
while dist[cur] < 0 :
    dist[cur] = cycle 
    cycle += v[cur] - cur
    cur = v[cur] % N

NK = N * K

m = NK % cycle
cur = v[cur] % N
s = 0
while m > dist[cur] > 0 :
    s = dist[cur]
    cur = v[cur] % N
m -= s

ret = []
seen = set()
for a in A[N-m:] :
    if a in seen :
        p = ret.pop()
        while p != a :
            seen.remove(p)
            p = ret.pop()
    else :
        ret.append(a)
        seen.add(a)
        
print(' '.join([str(i) for i in ret]))

Fixed submission:
import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
cycle = 0
while dist[cur] < 0 :
    dist[cur] = cycle 
    cycle += v[cur] - cur
    cur = v[cur] % N

NK = N * K

m = NK % cycle
cur = v[cur] % N
s = 0
while m > dist[cur] > 0 :
    s = dist[cur]
    cur = v[cur] % N
m -= s

ret = []
seen = set()
for a in A[N-m:] :
    if a in seen :
        p = ret.pop()
        seen.remove(a)
        while p != a :
            seen.remove(p)
            p = ret.pop()
    else :
        ret.append(a)
        seen.add(a)
        
print(' '.join([str(i) for i in ret]))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline

'''
9 4
1 8 6 6 8 7 8 1 9
'''

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
s = 0
while dist[cur] < 0 :
    dist[cur] = s 
    s += v[cur] - cur
    cur = v[cur] % N

# d1 - ループに入るまでの長さ, d2 - ループの長さ
d1 = dist[cur]
d2 = s - d1
NK = N * K

if NK > d1 :
    m = (NK-d1) % d2
    cur = v[cur] % N
    s = 0
    while m > dist[cur] - d1 > 0 :
        s = dist[cur] - d1
        cur = v[cur] % N
    m -= s
else :
    m = N

ret = []
if m != 0 :
    last = dict()
    for a in A[-m:] :
        if a in ret :
            ret = ret[:ret.index(a)]
        else :
            ret.append(a)
        
print(' '.join([str(i) for i in ret]))

Fixed submission:
import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
cycle = 0
while dist[cur] < 0 :
    dist[cur] = cycle 
    cycle += v[cur] - cur
    cur = v[cur] % N

NK = N * K

m = NK % cycle
cur = v[cur] % N
s = 0
while m > dist[cur] > 0 :
    s = dist[cur]
    cur = v[cur] % N
m -= s

ret = []
seen = set()
for a in A[N-m:] :
    if a in seen :
        p = ret.pop()
        seen.remove(a)
        while p != a :
            seen.remove(p)
            p = ret.pop()
    else :
        ret.append(a)
        seen.add(a)
        
print(' '.join([str(i) for i in ret]))

Buggy python submission (verdict: Time Limit Exceeded):
N, K = map(int, input().split())
A = [int(i) for i in input().split()]

dist = dict()
i = 0
s = 0
while True :
    cur = i % N
    if cur in dist :
        d1 = dist[cur][1]
        d2 = i - d1
        break
    
    i += 1
    while A[i%N] != A[cur] :
        i += 1
    
    i += 1
    dist[cur] = (i%N, s)
    s = i

if N*K > d1 :
    m = (N*K - d1) % d2
    while m > dist[dist[cur][0]][1] - d1 :
        cur = dist[cur][0]
    m -= dist[cur][1] - d1
else :
    m = 0
  
ret = []
for a in A[-m:] :
    if a in ret :
        ret = ret[:ret.index(a)]
    else :
        ret.append(a)
        
print(' '.join([str(i) for i in ret]))

Fixed submission:
import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
cycle = 0
while dist[cur] < 0 :
    dist[cur] = cycle 
    cycle += v[cur] - cur
    cur = v[cur] % N

NK = N * K

m = NK % cycle
cur = v[cur] % N
s = 0
while m > dist[cur] > 0 :
    s = dist[cur]
    cur = v[cur] % N
m -= s

ret = []
seen = set()
for a in A[N-m:] :
    if a in seen :
        p = ret.pop()
        seen.remove(a)
        while p != a :
            seen.remove(p)
            p = ret.pop()
    else :
        ret.append(a)
        seen.add(a)
        
print(' '.join([str(i) for i in ret]))

Buggy python submission (verdict: Time Limit Exceeded):
N, K = map(int, input().split())
A = [int(i) for i in input().split()]

rlist = []
i = 0
while True :
    cur = i
    i += 1
    while A[i%N] != A[cur%N] :
        i += 1
    rlist.append(i-cur+1)
    if i % N == N - 1 :
        break
    i += 1

s = sum(rlist) 
m = N*K%s

ss = 0
for r in rlist :
    if ss + r < m :
        ss += r
    else :
        break     

ret = []
for a in A[ss % N:] :
    if not a in ret :
        ret.append(a)
    else :
        ret = ret[:ret.index(a)]
        
print(' '.join([str(i) for i in ret]))

Fixed submission:
import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [int(i) for i in input().split()]

last = dict()
v = [-1] * N

for i, a in enumerate(A + A) :
    if a in last and last[a] < N :
        v[last[a]] = i + 1
    
    last[a] = i

dist = [-1] * N
cur = 0
cycle = 0
while dist[cur] < 0 :
    dist[cur] = cycle 
    cycle += v[cur] - cur
    cur = v[cur] % N

NK = N * K

m = NK % cycle
cur = v[cur] % N
s = 0
while m > dist[cur] > 0 :
    s = dist[cur]
    cur = v[cur] % N
m -= s

ret = []
seen = set()
for a in A[N-m:] :
    if a in seen :
        p = ret.pop()
        seen.remove(a)
        while p != a :
            seen.remove(p)
            p = ret.pop()
    else :
        ret.append(a)
        seen.add(a)
        
print(' '.join([str(i) for i in ret]))