結果

問題 No.3291 K-step Navigation
ユーザー lif4635
提出日時 2025-10-03 22:42:34
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 3,315 bytes
コンパイル時間 440 ms
コンパイル使用メモリ 82,360 KB
実行使用メモリ 458,120 KB
最終ジャッジ日時 2025-10-03 22:43:35
合計ジャッジ時間 55,249 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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ファイルパターン 結果
sample AC * 2
other AC * 42 WA * 8
権限があれば一括ダウンロードができます

ソースコード

diff # 

# input
import sys
input = sys.stdin.readline
II = lambda : int(input())
MI = lambda : map(int, input().split())
LI = lambda : [int(a) for a in input().split()]
SI = lambda : input().rstrip()
LLI = lambda n : [[int(a) for a in input().split()] for _ in range(n)]
LSI = lambda n : [input().rstrip() for _ in range(n)]
MI_1 = lambda : map(lambda x:int(x)-1, input().split())
LI_1 = lambda : [int(a)-1 for a in input().split()]

mod = 998244353
inf = 10 ** 18 + 10
ordalp = lambda s : ord(s)-65 if s.isupper() else ord(s)-97
ordallalp = lambda s : ord(s)-39 if s.isupper() else ord(s)-97
yes = lambda : print("Yes")
no = lambda : print("No")
yn = lambda flag : print("Yes" if flag else "No")

prinf = lambda ans : print(ans if ans < 1000001001001001001 else -1)
alplow = "abcdefghijklmnopqrstuvwxyz"
alpup = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
alpall = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
URDL = {'U':(-1,0), 'R':(0,1), 'D':(1,0), 'L':(0,-1)}
DIR_4 = [[-1,0],[0,1],[1,0],[0,-1]]
DIR_8 = [[-1,0],[-1,1],[0,1],[1,1],[1,0],[1,-1],[0,-1],[-1,-1]]
DIR_BISHOP = [[-1,1],[1,1],[1,-1],[-1,-1]]
prime60 = [2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59]
sys.set_int_max_str_digits(0)
# sys.setrecursionlimit(10**6)
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')

from collections import defaultdict,deque
from heapq import heappop,heappush
from bisect import bisect_left,bisect_right
DD = defaultdict
BSL = bisect_left
BSR = bisect_right

n, m, k, s, t = MI()
s -= 1
t -= 1

e = [[] for i in range(n)]
e2 = [[0] * n for i in range(n)]

for i in range(m):
    u, v = MI_1()
    e[u].append(v)
    e[v].append(u)
    e2[u][v] = 1
    e2[v][u] = 1

if k & 1:
    yes()
    exit()

def solve(i):
    d = [[inf, inf] for i in range(n)]
    d[i][0] = 0
    st = deque([i])
    while st:
        u = st.popleft()
        if u >= 0:
            f = 0
        else:
            u = ~u
            f = 1
        
        nd = d[u][f]
        for v in e[u]:
            if d[v][f^1] == inf:
                d[v][f^1] = nd+1
                if f^1:
                    st.append(~v)
                else:
                    st.append(v)
    return d

d = []
for i in range(n):
    d.append(solve(i))
    # print(d[i])

if d[s][t][k&1] <= k:
    yes()
    exit()

# 新しく辺を追加するとき
for i in range(n):
    for j in range(i+1, n):
        # i - j をついか
        if e2[i][j]: continue
        
        for f in range(2):
            for g in range(2):
                if (f^g) != k&1:
                    if d[s][i][f] + d[j][t][g] <= k-1:
                        yes()
                        exit() 
                    if d[s][j][f] + d[i][t][g] <= k-1:
                        yes()
                        exit() 
                    if d[s][i][f] + d[i][t][g] + d[i][j][0] <= k-1:
                        yes()
                        exit()
                    if d[s][j][f] + d[j][t][g] + d[i][j][0] <= k-1:
                        yes()
                        exit()
                else:
                    if d[s][i][f] + d[j][t][g] + d[i][j][0] <= k-2:
                        yes()
                        exit() 
                    if d[s][j][f] + d[i][t][g] + d[i][j][0] <= k-2:
                        yes()
                        exit()
                
no()
0