31618번: カードゲーム 2 (Card Game 2) ↗

import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
# sys.setrecursionlimit(10**7)

BLANK = " "

# inp = input
inp = lambda : sys.stdin.readline().rstrip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print

def solve():
    n = ii()
    l = mii()

    d = {}

    for i in l:
        d[i] = True

    for i in l:
        if d.get(i + 3, False) and d.get(i + 6, False):
            p("Yes")
            break
    else:
        p("No") 

if __name__ == "__main__":
  tc = 1

  for t in range(1, tc+1):
    ret = solve()