結果

問題 No.679 不思議マーケット
ユーザー Coki628Coki628
提出日時 2020-09-02 19:01:10
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 84 ms / 2,000 ms
コード長 2,127 bytes
コンパイル時間 145 ms
コンパイル使用メモリ 82,568 KB
実行使用メモリ 77,824 KB
最終ジャッジ日時 2024-11-21 16:59:56
合計ジャッジ時間 1,882 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 42 ms
54,272 KB
testcase_01 AC 44 ms
54,272 KB
testcase_02 AC 47 ms
54,272 KB
testcase_03 AC 84 ms
77,824 KB
testcase_04 AC 80 ms
77,184 KB
testcase_05 AC 77 ms
77,628 KB
testcase_06 AC 59 ms
70,144 KB
testcase_07 AC 49 ms
57,728 KB
testcase_08 AC 71 ms
73,088 KB
testcase_09 AC 45 ms
54,272 KB
testcase_10 AC 56 ms
65,024 KB
testcase_11 AC 49 ms
57,728 KB
testcase_12 AC 62 ms
68,608 KB
testcase_13 AC 64 ms
68,992 KB
testcase_14 AC 63 ms
68,352 KB
testcase_15 AC 50 ms
58,368 KB
testcase_16 AC 44 ms
54,400 KB
testcase_17 AC 42 ms
54,912 KB
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 #

import sys
from collections import Counter

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10**9)
INF = 10**19
MOD = 10**9 + 7
EPS = 10**-10

def SCC(N, edges):
    """ 強連結成分分解 """

    nodes1 = [[] for i in range(N)]
    nodes2 = [[] for i in range(N)]
    for u, v in edges:
        nodes1[u].append(v)
        nodes2[v].append(u)

    T = []
    visited = [False] * N
    def rec1(cur):
        visited[cur] = True
        for nxt in nodes1[cur]:
            if not visited[nxt]:
                rec1(nxt)
        T.append(cur)

    for u in range(N):
        if not visited[u]:
            rec1(u)

    visited = [False] * N
    group = [0] * N
    grpnum = 0
    def rec2(cur):
        group[cur] = grpnum
        visited[cur] = True
        for nxt in nodes2[cur]:
            if not visited[nxt]:
                rec2(nxt)

    for u in reversed(T):
        if not visited[u]:
            rec2(u)
            grpnum += 1
    return grpnum, group

N, M = MAP()
edges = []
nodes = [[] for i in range(N)]
for i in range(M):
    g, r = MAP()
    g -= 1
    H = [h-1 for h in LIST()]
    for h in H:
        edges.append((g, h))
        nodes[g].append(h)

grpnum, group = SCC(N, edges)
C = Counter(group)
ok = [1] * N
for i, g in enumerate(group):
    if C[g] > 1:
        ok[i] = 0

memo = [-1] * N
def dfs(u):
    if memo[u] != -1:
        return memo[u]
    if not ok[u]:
        memo[u] = 0
        return 0
    res = 1
    for v in nodes[u]:
        res &= dfs(v)
    memo[u] = res
    return res

for i in range(N):
    dfs(i)
ans = sum(memo)
print(ans)
0