結果

問題 No.3200 Sinking Islands
コンテスト
ユーザー しもりん
提出日時 2025-07-15 19:29:47
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 485 ms / 2,000 ms
コード長 3,062 bytes
コンパイル時間 392 ms
コンパイル使用メモリ 82,376 KB
実行使用メモリ 160,832 KB
最終ジャッジ日時 2025-07-15 19:29:59
合計ジャッジ時間 10,579 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
このコードへのチャレンジ
（要ログイン）
ファイルパターン 結果
sample AC * 2
other AC * 20
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 # 

from collections import Counter, deque, defaultdict
from heapq import heapify, heappop, heappush, nlargest, nsmallest
from bisect import bisect_left, bisect, bisect_right
from string import ascii_lowercase, ascii_uppercase, digits
from copy import deepcopy
from time import perf_counter
import sys
from typing import Any, List, Callable


def debug(*args, sep=" ", end="\n") -> None:
    print(*args, sep=sep, end=end, file=sys.stderr)


def yn(b):
    print('Yes' if b else 'No')
    return b


def gcd(a, b):
    a = abs(a); b = abs(b)
    if a < b: a, b = b, a
    while b > 0:
        a, b = b, a % b
    return a


def lcm(a, b):
    return a * b // gcd(a, b)


class UnionFind:
    def __init__(self, n) -> None:
        self.n = n
        self.parents = [-1 for _ in range(n)]

    def find(self, x):
        path = []
        while self.parents[x] >= 0:
            path.append(x)
            x = self.parents[x]
        for y in path:
            self.parents[y] = x
        return x

    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return False
        if self.parents[x] > self.parents[y]:
            x, y = y, x
        self.parents[x] += self.parents[y]
        self.parents[y] = x
        return True

    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 len(self.roots())

    def all_group_members(self):
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members

    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())


def main():
    global inf, MOD
    input = sys.stdin.read().split()
    ptr = 0
    inf = float("inf")
    MOD = 998244353

    N, M = map(int, input[ptr:ptr + 2]); ptr += 2
    E = []
    for _ in range(M):
        u, v = map(lambda x: int(x) - 1, input[ptr:ptr + 2]); ptr += 2
        E.append((u, v))
    Q = int(input[ptr]); ptr += 1
    B = list(map(lambda x: int(x) - 1, input[ptr:ptr + Q])); ptr += Q
    usable = [True] * M
    for b in B:
        usable[b] = False
    U = UnionFind(N)
    for i in range(M):
        if usable[i]:
            u, v = E[i]
            U.union(u, v)
    ans = [N * (N - 1) // 2]
    for r in U.roots():
        s = U.size(r)
        ans[0] -= s * (s - 1) // 2
    for i in range(Q - 1):
        b = B[-i - 1]
        u, v = E[b]
        if U.same(u, v):
            d = 0
        else:
            s, t = U.size(u), U.size(v)
            d = s * t
            U.union(u, v)
        ans.append(ans[-1] - d)
    for a in ans[::-1]:
        print(a)
    # debug(ans[0])
    # debug(ans[-1])


if __name__ == "__main__":
    main()
0