結果

問題 No.1382 Travel in Mitaru city
ユーザー 👑 rin204
提出日時 2022-04-16 16:15:11
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 695 ms / 2,000 ms
コード長 1,974 bytes
コンパイル時間 373 ms
コンパイル使用メモリ 82,176 KB
実行使用メモリ 112,628 KB
最終ジャッジ日時 2024-12-25 20:19:09
合計ジャッジ時間 27,662 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 68
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ソースコード

diff #
プレゼンテーションモードにする

class UnionFind:
    def __init__(self, n):
        self.n = n
        self.parents = [-1] * n
        self.group = n
    def find(self, x):
        if self.parents[x] < 0:
            return x
        else:
            self.parents[x] = self.find(self.parents[x])
            return self.parents[x]
    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return
        self.group -= 1
        if self.parents[x] > self.parents[y]:
            x, y = y, x
        self.parents[x] += self.parents[y]
        self.parents[y] = x
    def size(self, x):
        return -self.parents[self.find(x)]
    def same(self, x, y):
        return self.find(x) == self.find(y)
    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]
    def roots(self):
        return [i for i, x in enumerate(self.parents) if x < 0]
    def group_count(self):
        return self.group
    def all_group_members(self):
        dic = {r:[] for r in self.roots()}
        for i in range(self.n):
            dic[self.find(i)].append(i)
        return dic
    def __str__(self):
        return '\n'.join('{}: {}'.format(r, self.members(r)) for r in self.roots())
n, m, s, t = map(int, input().split())
P = list(map(int, input().split()))
s -= 1
t -= 1
edges = [[] for _ in range(n)]
for _ in range(m):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    if P[a] > P[b]:
        a, b = b, a
    edges[a].append(b)
    
dic = {}
for i, p in enumerate(P):
    if p not in dic:
        dic[p] = []
    dic[p].append(i)
    
ans = 0
UF = UnionFind(n)
for p in sorted(dic.keys(), reverse = True):
    flg = False
    tmp = []
    for u in dic[p]:
        for v in edges[u]:
            if P[v] != P[u] and UF.same(v, s):
                flg = True
    if flg:
        ans += 1
    for u in dic[p]:
        for v in edges[u]:
            UF.union(u, v)
    
print(ans)
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