Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF = float("inf")
MOD = 10**9 + 7 # 998244353
input = lambda:sys.stdin.readline().rstrip()
def resolve():
    n, k = map(int, input().split())
    dp = [0] * (k + 1)
    dp[0] = 1
    for a in map(int, input().split()):
        # accumulate dp
        S = [0] * (k + 2)
        for i in range(k + 1):
            S[i + 1] = S[i] + dp[i]
            if S[i + 1] >= MOD:
                S[i + 1] -= MOD
        # ndp[i] = dp[i - a] + ... + dp[i]
        dp = [S[i + 1] - S[max(0, i - a)] for i in range(k + 1)]

    print(dp[k])
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n,k=map(int,input().split())
    A=list(map(int,input().split()))
    dp=[0]*(k+1)
    dp[k]=1
    for i in range(n):
        ndp=[0]*(k+1)
        # dpの累積和を取っておく
        S=[0]*(k+2)
        for j in range(k+1):
            S[j+1]=S[j]+dp[j]
            S[j+1]%=MOD
        # iterete
        for j in range(k+1):
            ndp[j]=S[min(j+A[i]+1,k+1)]-S[j]
            ndp[j]%=MOD
        dp=ndp
    print(dp[0])
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF = float("inf")
MOD = 10**9 + 7 # 998244353
input = lambda:sys.stdin.readline().rstrip()
from functools import lru_cache
def resolve():
    n = int(input())
    A = list(map(int, input().split()))
    S = [0] * (n + 1)
    for i in range(n):
        S[i + 1] = S[i] + A[i]

    @lru_cache(None)
    def dfs(l, r):
        # base case
        if r - l == 1:
            return 0
        # recursion
        return min(dfs(l, m) + dfs(m, r) + S[r] - S[l] for m in range(l + 1, r))

    print(dfs(0, n))
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    A=list(map(int,input().split()))
    S=[0]*(n+1)
    for i in range(n): S[i+1]=S[i]+A[i]
    dp=[[INF]*(n+1) for _ in range(n+1)]

    def dfs(L,R):
        if(R-L==1): return 0
        if(dp[L][R]!=INF): return dp[L][R]
        res=INF
        for h in range(L+1,R):
            res=min(res,dfs(L,h)+dfs(h,R)+S[R]-S[L])
        dp[L][R]=res
        return res

    print(dfs(0,n))
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    E=[[] for _ in range(n)]
    for _ in range(n-1):
        x,y=map(int,input().split())
        x-=1; y-=1
        E[x].append(y)
        E[y].append(x)
    dp=[[-1]*2 for _ in range(n)] # dp[i][color] 白:0 黒:1
    def dfs(v,p)->NoneType:
        if(dp[v][0]!=-1 and dp[v][1]!=-1): return
        white=black=1
        for nv in E[v]:
            if(nv==p): continue
            dfs(nv,v)
            white*=dp[nv][0]+dp[nv][1] # 白は常にOK
            white%=MOD
            black*=dp[nv][0]           # 黒は子の全てが白のときのみ
            black%=MOD
        dp[v][0]=white
        dp[v][1]=black
    dfs(0,-1)
    print((dp[0][0]+dp[0][1])%MOD)
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7 # 998244353
input=lambda:sys.stdin.readline().rstrip()
def resolve():
    n = int(input())
    E = [[] for _ in range(n)]
    for _ in range(n - 1):
        u, v = map(int,input().split())
        u -= 1; v -= 1
        E[u].append(v)
        E[v].append(u)
    deg = [len(E[v]) - 1 for v in range(n)]
    deg[0] += 1

    topological_sort = []
    parent = [None] * n
    stack = [(~0, -1), (0, -1)] # (v, p)
    while stack:
        v, p = stack.pop()
        if v >= 0:
            parent[v] = p
            for nv in E[v]:
                if nv == p:
                    continue
                stack.append((~nv, v))
                stack.append((nv, v))
        else:
            if deg[~v] == 0:
                topological_sort.append(~v)
            deg[p] -= 1

    dp = [[None] * 2 for _ in range(n)]
    for v in topological_sort:
        white = black = 1
        for nv in E[v]:
            if nv == parent[v]:
                continue
            white *= dp[nv][0] + dp[nv][1]
            black *= dp[nv][0]
            white %= MOD
            black %= MOD
        dp[v][0] = white
        dp[v][1] = black

    print((dp[0][0] + dp[0][1]) % MOD)
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF = float("inf")
MOD = 10**9 + 7 # 998244353
input = lambda:sys.stdin.readline().rstrip()
from itertools import accumulate
def resolve():
    n = int(input())
    # dp[i][j] : i まで見て末尾が j のもの (i <= j)
    dp = [0] * n
    dp[0] = 1
    for i, c in enumerate(input(), 1):
        S = list(accumulate([0] + dp))
        dp = [0] * n
        if c == '<':
            # ndp[j] = dp[0] + ... + dp[j - 1] # j <= i
            for j in range(i + 1):
                dp[j] = S[j]
        elif c == '>':
            # ndp[j] = dp[j] + ... + dp[i - 1] # j <= i
            for j in range(i + 1):
                dp[j] = S[i] - S[j]

    print(sum(dp) % MOD)
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    s=input()
    dp=[1]*n
    for i in range(1,n):
        ndp=[0]*n
        S=[0]*(n+1)
        for j in range(n):
            S[j+1]=S[j]+dp[j]
        for less in range(n-i):
            if(s[i-1]=='<'): ndp[less]=S[less+1]
            else: ndp[less]=S[n]-S[less+1]
            ndp[less]%=MOD
        dp=ndp
    print(dp[0])
resolve()
Buggy python submission (verdict: Runtime Error):
n,m = map(int,input().split())
C = [[i,*map(int,input().split())] for i in range(m)]
C.sort(key=lambda c:c[1:])
prev = 0
count = 0
for c in C:
    if prev==c[1]: count+=1
    else: count=1
    c.append(format(c[1],'0>6')+format(count,'0>6'))
    prev=c[1]

for c in sorted(C, key=lambda c:c[0]):
    print(c[3])

Fixed submission:
n,m = map(int,input().split())
C = [[i]+list(map(int,input().split())) for i in range(m)]
C.sort(key=lambda c:c[1:])
prev = 0
count = 0
for c in C:
    if prev==c[1]: count+=1
    else: count=1
    c.append(format(c[1],'0>6')+format(count,'0>6'))
    prev=c[1]

for c in sorted(C, key=lambda c:c[0]):
    print(c[3])
Buggy python submission (verdict: Runtime Error):
import math
N,T = map(int,input().split())
score = math.inf
for i in range(N):
    c,t = map(int,input().split())
    if t<=T: score = min(score,c)
        
print("TLE" if score==math.inf else score)

Fixed submission:
N,T = map(int,input().split())
score = 1001
for i in range(N):
    c,t = map(int,input().split())
    if t<=T: score = min(score,c)
        
print("TLE" if score==1001 else score)
Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    A=map(int,input().split())
    B=[a-i for i,a in enumerate(A)]
    B.sort()
    f=lambda x:sum(abs(x-b) for b in B)
    ans=min(f(B[n//2]),f(B[n//2+1]))
    print(ans)
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    A=map(int,input().split())
    B=[a-i for i,a in enumerate(A)]
    if n==1:
        print(0)
        return
    B.sort()
    f=lambda x:sum(abs(x-b) for b in B)
    ans=min(f(B[n//2]),f(B[n//2+1]))
    print(ans)
resolve()
Buggy python submission (verdict: Runtime Error):
import sys
INF = 1 << 60
MOD = 10**9 + 7 # 998244353
sys.setrecursionlimit(2147483647)
input = lambda:sys.stdin.readline().rstrip()
from itertools import groupby
def resolve():
    n, k, q = map(int, input().split())
    A = list(map(int, input().split()))
    B = sorted(A)

    ans = INF
    for i, m in enumerate(B):
        score = 0
        for key, it in groupby([a >= m for a in A]):
            if key is False:
                continue
            l = sum(1 for _ in it)
            score += max(0, l - k + 1)

        if score >= q:
            ans = min(ans, B[i + q - 1] - m)

    print(ans)
resolve()

Fixed submission:
import sys
INF = 1 << 60
MOD = 10**9 + 7 # 998244353
sys.setrecursionlimit(2147483647)
input = lambda:sys.stdin.readline().rstrip()
from itertools import groupby
from heapq import heappop, heappush, heapify
def resolve():
    n, k, q = map(int, input().split())
    A = list(map(int, input().split()))

    ans = INF
    for m in sorted(A):
        C = []
        for key, it in groupby(A, key = lambda a : a >= m):
            if key is False:
                continue
            D = list(it)
            if len(D) >= k:
                D.sort()
                C.append(D[:len(D) - k + 1][::-1])

        if sum(len(a) for a in C) < q:
            continue
        heap = [(C[i].pop(), i) for i in range(len(C))]
        heapify(heap)
        for _ in range(q):
            M, i = heappop(heap)
            if C[i]:
                heappush(heap, (C[i].pop(), i))
        ans = min(ans, M - m)

    print(ans)
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    S=input()
    k=int(input())
    n=len(S)
    D=set()
    for j in range(n+1):
        for i in range(j):
            D.add(S[i:j])
    print(sorted(D)[k-1])
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()

class SuffixArray(object):
    def __init__(self,s):
        self.__s=s
        self.__n=len(s)
        self.__suffix_array()
        self.__lcp_array()
        self.__sparse_table()

    def __suffix_array(self):
        s=self.__s; n=self.__n
        sa=list(range(n))
        rank=[ord(s[i]) for i in range(n)]
        tmp=[0]*n
        k=1
        cmp_key=lambda i:(rank[i],rank[i+k] if i+k<n else -1)
        while(k<=n):
            sa.sort(key=cmp_key)
            tmp[sa[0]]=0
            for i in range(1,n):
                tmp[sa[i]]=tmp[sa[i-1]]+(cmp_key(sa[i-1])<cmp_key(sa[i]))
            rank=tmp[:]
            k<<=1
        self.__sa=sa
        self.__rank=rank

    def __lcp_array(self):
        s=self.__s; n=self.__n
        sa=self.__sa; rank=self.__rank
        lcp=[0]*n
        h=0
        for i in range(n):
            j=sa[rank[i]-1]
            if(h>0): h-=1
            if(rank[i]==0): continue
            while(j+h<n and i+h<n and s[j+h]==s[i+h]): h+=1
            lcp[rank[i]]=h
        self.__lcp=lcp

    def __sparse_table(self):
        n=self.__n
        logn=max(0,(n-1).bit_length())
        table=[[0]*n for _ in range(logn)]
        table[0]=self.__lcp[:]
        from itertools import product
        for i,k in product(range(1,logn),range(n)):
            if(k+(1<<(i-1))>=n): table[i][k]=table[i-1][k]
            else: table[i][k]=min(table[i-1][k],table[i-1][k+(1<<(i-1))])
        self.__table=table

    @property
    def suffix(self):
        return self.__sa

    def lcp(self,a,b):
        if(a==b): return self.__n-a
        l,r=self.__rank[a],self.__rank[b]
        l,r=min(l,r)+1,max(l,r)+1
        i=max(0,(r-l-1).bit_length()-1)
        table=self.__table
        return min(table[i][l],table[i][r-(1<<i)])

def resolve():
    S=input()
    n=len(S)
    k=int(input())

    if(n==1):
        print(S)
        return

    sa=SuffixArray(S)
    D=set()
    for i in sa.suffix:
        for j in range(i+1,n+1):
            D.add(S[i:j])
            if(len(D)==k):
                print(sorted(D)[-1])
                return
resolve()
Buggy python submission (verdict: Runtime Error):
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = sorted(s|t)
for i in u: if a<=i<=b: print(i)

Fixed submission:
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = sorted(s|t)
for i in u:
    if a<=i<=b: print(i)

Buggy python submission (verdict: Time Limit Exceeded):
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = sorted((s|t)&set(range(a,b+1)))
print(*u,sep="\n")

Fixed submission:
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = sorted(s|t)
for i in u:
    if a<=i<=b: print(i)

Buggy python submission (verdict: Time Limit Exceeded):
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = (s|t)&set(range(a,b+1))
for i in sorted(u): print(i)

Fixed submission:
a,b,k = map(int,input().split())
s = set(range(a,a+k))
t = set(range(b-k+1,b+1))
u = sorted(s|t)
for i in u:
    if a<=i<=b: print(i)
Buggy python submission (verdict: Runtime Error):
def resolve():
    a,b,c=sorted(list(map(int,input().split())))
    ans=c-b
    a+=c-b
    b=c
    if (c-a)%2==0: print(ans+(c-a)//2)
    else: print(ans+2+(c-a)//2)
resolve(

Fixed submission:
def resolve():
    a,b,c=sorted(list(map(int,input().split())))
    ans=c-b
    a+=c-b
    b=c
    if (c-a)%2==0: print(ans+(c-a)//2)
    else: print(ans+2+(c-a)//2)
resolve()
Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda:sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    A=[None]*n
    B=[None]*n
    for i in range(n):
        A[i],B[i]=map(int,input().split())

    d=sum(b-a for a,b in zip(A,B) if(a<b))
    s=min(b for a,b in zip(A,B) if(a>=b and a-b<d))
    print(sum(A)-s)
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda:sys.stdin.readline().rstrip()
def resolve():
    n=int(input())
    A=[None]*n
    B=[None]*n
    for i in range(n):
        A[i],B[i]=map(int,input().split())

    if(A==B):
        print(0)
        return
    print(sum(A)-min(b for a,b in zip(A,B) if(a>b)))
resolve()
Buggy python submission (verdict: Runtime Error):
import sys
INF = 1 << 60
MOD = 10**9 + 7 # 998244353
sys.setrecursionlimit(2147483647)
input = lambda:sys.stdin.readline().rstrip()
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import maximum_bipartite_matching
def resolve():
    n = int(input())
    A = [tuple(map(int, input().split())) for _ in range(n)]
    B = [tuple(map(int, input().split())) for _ in range(n)]

    graph = csr_matrix([[int(A[i][0] < B[j][0] and A[i][1] < B[j][1]) for j in range(n)] for i in range(n)])
    ans = 0
    for a in maximum_bipartite_matching(graph):
        if a != -1:
            ans += 1
    print(ans)
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()

from collections import deque
class Dinic:
    def __init__(self,n):
        self.__n=n
        self.__E=[[] for _ in range(n)]
        self.__depth=None
        self.__progress=None

    def add_link(self,u,v,w):
        self.__E[u].append([v,w,len(self.__E[v])])
        self.__E[v].append([u,0,len(self.__E[u])-1])

    def __bfs(self,s):
        depth=[-1]*self.__n
        depth[s]=0
        Q=deque([s])
        while(Q):
            v=Q.popleft()
            for nv,w,rev in self.__E[v]:
                if(w>0 and depth[nv]<0):
                    depth[nv]=depth[v]+1
                    Q.append(nv)
        self.__depth=depth

    def __dfs(self,v,t,flow):
        if(v==t): return flow
        for i in range(self.__progress[v],len(self.__E[v])):
            self.__progress[v]=i
            nv,w,rev=self.__E[v][i]
            if(w==0 or self.__depth[v]>=self.__depth[nv]): continue
            d=self.__dfs(nv,t,min(flow,w))
            if(d==0): continue
            self.__E[v][i][1]-=d
            self.__E[nv][rev][1]+=d
            return d
        return 0

    def flow(self,s,t):
        flow=0
        while(True):
            self.__bfs(s)
            if(self.__depth[t]<0): return flow
            self.__progress=[0]*self.__n
            current_flow=self.__dfs(s,t,INF)
            while(current_flow):
                flow+=current_flow
                current_flow=self.__dfs(s,t,INF)

def resolve():
    n=int(input())
    AB=[tuple(map(int,input().split())) for _ in range(n)]
    CD=[tuple(map(int,input().split())) for _ in range(n)]

    # bipartite の maximum matching で解く
    mf=Dinic(2*n+2)
    for i in range(n):
        mf.add_link(0,i+1,1)
        mf.add_link(n+i+1,2*n+1,1)
    for i in range(n):
        a,b=AB[i]
        for j in range(n):
            c,d=CD[j]
            if(a<c and b<d):
                mf.add_link(i+1,n+j+1,1)

    print(mf.flow(0,2*n+1))
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    def prime(n):
        if n<=1: return False
        A = [i for i in range(2, n+1)]
        P = []
        lim = n**.5
        while True:
            prime = A[0]
            if prime > lim: break
            P.append(prime)
            i = 0
            while i < len(A):
                if A[i] % prime == 0:
                    A.pop(i)
                    continue
                i += 1
        for a in A:
            P.append(a)
        return P

    C=5+10**5
    S=[0]*C
    T=[0]*C
    for p in prime(C):
        S[p]=1
    for i in range(C):
        if i%2==0: continue
        if S[i]==1 and S[(i+1)//2]==1:
            T[i]=1
    # cumsum
    for i in range(C-1):
        T[i+1]+=T[i]
    # input
    q=int(input())
    for _ in range(q):
        l,r=map(int,input().split())
        print(T[r]-T[l-1])
resolve()

Fixed submission:
import sys
sys.setrecursionlimit(2147483647)
INF=float("inf")
MOD=10**9+7
input=lambda :sys.stdin.readline().rstrip()
def resolve():
    def prime(n):
        if n<=1: return False
        A = [i for i in range(2, n+1)]
        P = []
        lim = n**.5
        while True:
            prime = A[0]
            if prime > lim: break
            P.append(prime)
            i = 0
            while i < len(A):
                if A[i] % prime == 0:
                    A.pop(i)
                    continue
                i += 1
        for a in A:
            P.append(a)
        return P

    C=5+10**5
    S=[0]*C
    T=[0]*C
    for p in prime(C):
        S[p]=1
    for i in range(C):
        if i%2==0: continue
        if S[i]==1 and S[(i+1)//2]==1:
            T[i]=1
    # cumsum
    for i in range(C-1):
        T[i+1]+=T[i]
    # input
    q=int(input())
    for _ in range(q):
        l,r=map(int,input().split())
        print(T[r]-T[l-1])
resolve()
Buggy python submission (verdict: Time Limit Exceeded):
a = set()
for _ in range(int(input())):
    a ^= {input()}
print(len(a))

Fixed submission:
a = set()
for _ in range(int(input())):
    a ^= {input()}
print(len(a))

Buggy python submission (verdict: Time Limit Exceeded):
a = set()
for _ in range(int(input())):
    a ^= {int(input())}
print(len(a))

Fixed submission:
a = set()
for _ in range(int(input())):
    a ^= {input()}
print(len(a))
Buggy python submission (verdict: Runtime Error):
import math
print(2**math.floor(math.log2(int(input()))))

Fixed submission:
import math
print(2**math.floor(math.log(int(input()))/math.log(2)))
Buggy python submission (verdict: Runtime Error):
from fractions import gcd
n,k=map(int,input().split())
g=0
m=0
for a in map(int,input().split()):
  	m=max(m,a)
    g=gcd(g,a)

print("POSSIBLE" if(k%g==0 and k<=m) else "IMPOSSIBLE")

Fixed submission:
from fractions import gcd
n,k=map(int,input().split())
g=0
m=0
for a in map(int,input().split()):
    g=gcd(g,a)
    m=max(m,a)

print("POSSIBLE" if(k%g==0 and k<=m) else "IMPOSSIBLE")

Buggy python submission (verdict: Runtime Error):
from fractions import gcd
n,k=map(int,input().split())
g=0
for a in map(int,input().split()):
    if(k==a):
        print("POSSIBLE")
        return
    g=gcd(g,a)

print("POSSIBLE" if(k%g==0) else "IMPOSSIBLE")

Fixed submission:
from fractions import gcd
n,k=map(int,input().split())
g=0
m=0
for a in map(int,input().split()):
    g=gcd(g,a)
    m=max(m,a)

print("POSSIBLE" if(k%g==0 and k<=m) else "IMPOSSIBLE")
Buggy python submission (verdict: Runtime Error):
N=int(input())
A=list(map(int,input().split()))
print(*A[::-2],*A[N%2::2])

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2], end=' ')
    print(*l[1::2])
else:
    print(*l[::-2], end=' ')
    print(*l[0::2])

Buggy python submission (verdict: Runtime Error):
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2],*l[1::2])
else:
    print(*l[::-2],*l[0::2])

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2], end=' ')
    print(*l[1::2])
else:
    print(*l[::-2], end=' ')
    print(*l[0::2])

Buggy python submission (verdict: Runtime Error):
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2],*l[1::2])
else:
    print(*l[::-2],*l[0::2])

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2], end=' ')
    print(*l[1::2])
else:
    print(*l[::-2], end=' ')
    print(*l[0::2])

Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
a = list(map(int,input().split()))
for i in range(0,n,2): print(a.pop(n-i-1),end=" ")
print(*a)

Fixed submission:
n = int(input())
l = list(map(int,input().split()))
if n%2:
    print(*l[::-2], end=' ')
    print(*l[1::2])
else:
    print(*l[::-2], end=' ')
    print(*l[0::2])
Buggy python submission (verdict: Time Limit Exceeded):
n = int(input())
s = [int(input()) for _ in range(n)]
t = list(range(1,n+1))
i = 1
count = 0

while(i in t):
    count += 1
    t.remove(i)
    i = s[i-1]
    if i==2:
        print(count)
        break
else:
    print(-1)

Fixed submission:
n = int(input())
s = [int(input()) for _ in range(n)]
t = set()
i = 1
count = 0

while(i not in t):
    count += 1
    t.add(i)
    i = s[i-1]
    if i==2:
        print(count)
        break
else:
    print(-1)