#935204 (PyPy3) No.2565 はじめてのおつかい

• 問題: No.2565 はじめてのおつかい
• ユーザー: かもめのうで
• 提出日時: 2023-12-02 16:37:07
• 言語: PyPy3 (7.3.15)
• 結果: AC
• 実行時間: 248 ms / 2,000 ms
• コード長: 1,525 bytes
• コンパイル時間: 186 ms
• コンパイル使用メモリ: 82,176 KB
• 実行使用メモリ: 90,112 KB
• 最終ジャッジ日時: 2024-09-26 20:31:29
• 合計ジャッジ時間: 11,216 ms
• ジャッジサーバーID （参考情報）: judge2 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 50

ソースコード

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# n, m = map(int, input().split())
# c = list(map(int, input().split()))
# cnt = [set() for _ in range(n)]
# for i in range(n):
#     cnt[c[i]-1].add(i)
# s = set()
# edge = [0]*n
# for _ in range(m):
#     v, u = map(int, input().split())
#     v -= 1
#     u -= 1
#     if c[v] == c[u]:
#         if (v, u) not in s and (u, v) not in s:
#             edge[c[v]-1] += 1
#             s.add((v, u))
#             s.add((u, v))
# ans = 0
# for e, t in zip(edge, cnt):
#     if len(t) == 0:
#         continue
#     ans += max(len(t)-1-e, 0)
# print(ans)
n, m = map(int, input().split())
g = [[] for _ in range(n)]
for _ in range(m):
    v, u = map(int, input().split())
    v -= 1
    u -= 1
    g[v].append(u)
from collections import deque
def culc_dist(st: int, g: list):
    dist = [-1]*n
    q = deque()
    q.append(st)
    dist[st] = 0
    while q:
        v = q.popleft()
        for nv in g[v]:
            if dist[nv] == -1:
                dist[nv] = dist[v] + 1
                q.append(nv)
    return dist
dist1 = culc_dist(0, g)
dist2 = culc_dist(n-2, g)
dist3 = culc_dist(n-1, g)
if (dist1[n-2] == -1 or dist2[n-1] == -1 or dist3[0] == -1) and (dist3[n-2] == -1 or dist1[n-1] == -1 or dist2[0] == -1):
    print(-1)
elif dist1[n-2] == -1 or dist2[n-1] == -1 or dist3[0] == -1:
    print(dist1[n-1]+dist3[n-2]+dist2[0])
elif dist3[n-2] == -1 or dist1[n-1] == -1 or dist2[0] == -1:
    print(dist1[n-2]+dist2[n-1]+dist3[0])
else:
    print(min(dist1[n-2]+dist2[n-1]+dist3[0], dist1[n-1]+dist3[n-2]+dist2[0]))
 
 
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