Buggy python submission (verdict: Time Limit Exceeded):
from bisect import bisect
N = int(input())
xs = list(map(int,input().split()))
L = int(input())
Q = int(input())
qs = [tuple(map(lambda x:int(x)-1, input().split())) for i in range(Q)]

K = len(bin(N)) - 1
dp = [[None]*N for i in range(K)]
for i,x in enumerate(xs):
    dp[0][i] = bisect(xs, x+L) - 1
for k in range(K-1):
    for i in range(N):
        dp[k+1][i] = dp[k][dp[k][i]]

def enough(fr,to,n):
    now = fr
    bn = bin(n)
    ln = len(bn)-2
    for i,c in enumerate(bn[2:]):
        if c=='0': continue
        now = dp[ln-1-i][now]
        if now >= to:
            return True
    return False

ans = []
for a,b in qs:
    if a>b: a,b = b,a
    ok = N
    ng = 0
    while ok-ng > 1:
        m = (ok+ng)//2
        if enough(a,b,m):
            ok = m
        else:
            ng = m
    ans.append(ok)

print(*ans,sep='\n')

Fixed submission:
from bisect import bisect
N = int(input())
xs = list(map(int,input().split()))
L = int(input())
Q = int(input())
qs = [tuple(map(lambda x:int(x)-1, input().split())) for i in range(Q)]

K = len(bin(N)) - 1
dp = [[None]*N for i in range(K)]
for i,x in enumerate(xs):
    dp[0][i] = bisect(xs, x+L) - 1
for k in range(K-1):
    for i in range(N):
        dp[k+1][i] = dp[k][dp[k][i]]

def enough(fr,to,n):
    now = fr
    bn = bin(n)
    ln = len(bn)-2
    for i,c in enumerate(bn[2:]):
        if c=='0': continue
        now = dp[ln-1-i][now]
        if now >= to:
            return True
    return False

ans = []
for a,b in qs:
    if a>b: a,b = b,a
    ok = N
    ng = 0
    while ok-ng > 1:
        m = (ok+ng)//2
        if enough(a,b,m):
            ok = m
        else:
            ng = m
    ans.append(ok)

print(*ans,sep='\n')

Buggy python submission (verdict: Time Limit Exceeded):
from bisect import bisect
N = int(input())
xs = list(map(int,input().split()))
L = int(input())
Q = int(input())
qs = [tuple(map(lambda x:int(x)-1, input().split())) for i in range(Q)]

K = len(bin(N)) - 1
dp = [[None]*N for i in range(K)]
for i,x in enumerate(xs):
    dp[0][i] = bisect(xs, x+L) - 1
for k in range(K-1):
    for i in range(N):
        dp[k+1][i] = dp[k][dp[k][i]]

def enough(fr,to,n):
    now = fr
    for k in reversed(range(K)):
        if n&(1<<k)==0: continue
        now = dp[k][now]
        if now >= to:
            return True
    return False

ans = []
for a,b in qs:
    if a>b: a,b = b,a
    ok = N
    ng = 0
    while ok-ng > 1:
        m = (ok+ng)//2
        if enough(a,b,m):
            ok = m
        else:
            ng = m
    ans.append(ok)

print(*ans,sep='\n')

Fixed submission:
from bisect import bisect
N = int(input())
xs = list(map(int,input().split()))
L = int(input())
Q = int(input())
qs = [tuple(map(lambda x:int(x)-1, input().split())) for i in range(Q)]

K = len(bin(N)) - 1
dp = [[None]*N for i in range(K)]
for i,x in enumerate(xs):
    dp[0][i] = bisect(xs, x+L) - 1
for k in range(K-1):
    for i in range(N):
        dp[k+1][i] = dp[k][dp[k][i]]

def enough(fr,to,n):
    now = fr
    bn = bin(n)
    ln = len(bn)-2
    for i,c in enumerate(bn[2:]):
        if c=='0': continue
        now = dp[ln-1-i][now]
        if now >= to:
            return True
    return False

ans = []
for a,b in qs:
    if a>b: a,b = b,a
    ok = N
    ng = 0
    while ok-ng > 1:
        m = (ok+ng)//2
        if enough(a,b,m):
            ok = m
        else:
            ng = m
    ans.append(ok)

print(*ans,sep='\n')