結果
問題 | No.1813 Magical Stones |
ユーザー | 👑 tamato |
提出日時 | 2022-01-14 23:07:55 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 569 ms / 2,000 ms |
コード長 | 3,227 bytes |
コンパイル時間 | 576 ms |
コンパイル使用メモリ | 87,468 KB |
実行使用メモリ | 113,168 KB |
最終ジャッジ日時 | 2023-08-12 21:57:21 |
合計ジャッジ時間 | 14,587 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge7 |
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 | 94 ms
72,092 KB |
testcase_01 | AC | 89 ms
72,092 KB |
testcase_02 | AC | 90 ms
72,112 KB |
testcase_03 | AC | 152 ms
98,220 KB |
testcase_04 | AC | 89 ms
71,744 KB |
testcase_05 | AC | 88 ms
72,148 KB |
testcase_06 | AC | 180 ms
81,024 KB |
testcase_07 | AC | 93 ms
72,388 KB |
testcase_08 | AC | 112 ms
78,072 KB |
testcase_09 | AC | 120 ms
78,216 KB |
testcase_10 | AC | 103 ms
77,252 KB |
testcase_11 | AC | 256 ms
91,240 KB |
testcase_12 | AC | 90 ms
72,200 KB |
testcase_13 | AC | 90 ms
71,740 KB |
testcase_14 | AC | 150 ms
98,120 KB |
testcase_15 | AC | 569 ms
112,888 KB |
testcase_16 | AC | 553 ms
112,016 KB |
testcase_17 | AC | 455 ms
109,240 KB |
testcase_18 | AC | 549 ms
112,120 KB |
testcase_19 | AC | 551 ms
112,196 KB |
testcase_20 | AC | 561 ms
112,816 KB |
testcase_21 | AC | 551 ms
112,252 KB |
testcase_22 | AC | 557 ms
113,168 KB |
testcase_23 | AC | 546 ms
112,132 KB |
testcase_24 | AC | 119 ms
78,304 KB |
testcase_25 | AC | 217 ms
86,532 KB |
testcase_26 | AC | 186 ms
81,852 KB |
testcase_27 | AC | 442 ms
105,480 KB |
testcase_28 | AC | 450 ms
99,644 KB |
testcase_29 | AC | 457 ms
104,716 KB |
testcase_30 | AC | 448 ms
102,996 KB |
testcase_31 | AC | 521 ms
112,660 KB |
testcase_32 | AC | 91 ms
72,084 KB |
testcase_33 | AC | 91 ms
71,940 KB |
testcase_34 | AC | 145 ms
79,260 KB |
testcase_35 | AC | 147 ms
79,416 KB |
testcase_36 | AC | 167 ms
80,664 KB |
testcase_37 | AC | 178 ms
83,168 KB |
testcase_38 | AC | 230 ms
96,356 KB |
testcase_39 | AC | 435 ms
108,592 KB |
testcase_40 | AC | 175 ms
81,260 KB |
testcase_41 | AC | 119 ms
78,092 KB |
testcase_42 | AC | 140 ms
79,492 KB |
testcase_43 | AC | 174 ms
81,520 KB |
ソースコード
mod = 1000000007 eps = 10**-9 def main(): import sys input = sys.stdin.readline from collections import deque # compressed[v]: 縮約後のグラフで縮約前のvが属する頂点 # num: 縮約後のグラフの頂点数 # 縮約後のグラフの頂点番号はトポロジカル順 def SCC(adj, adj_rev): N = len(adj) - 1 seen = [0] * (N + 1) compressed = [0] * (N + 1) order = [] for v0 in range(1, N + 1): if seen[v0]: continue st = deque() st.append(v0) while st: v = st.pop() if v < 0: order.append(-v) else: if seen[v]: continue seen[v] = 1 st.append(-v) for u in adj[v]: st.append(u) seen = [0] * (N + 1) num = 0 for v0 in reversed(order): if seen[v0]: continue num += 1 st = deque() st.append(v0) seen[v0] = 1 compressed[v0] = num while st: v = st.pop() for u in adj_rev[v]: if seen[u]: continue seen[u] = 1 compressed[u] = num st.append(u) return num, compressed # 縮約後のグラフを構築 # 先にSCC()を実行してnum, compressedを作っておく def construct(adj, num, compressed): N = len(adj) - 1 adj_compressed = [set() for _ in range(num + 1)] for v in range(1, N + 1): v_cmp = compressed[v] for u in adj[v]: u_cmp = compressed[u] if v_cmp != u_cmp: adj_compressed[v_cmp].add(u_cmp) return adj_compressed N, M = map(int, input().split()) adj = [[] for _ in range(N+1)] adj_rev = [[] for _ in range(N + 1)] for _ in range(M): a, b = map(int, input().split()) adj[a].append(b) adj_rev[b].append(a) NN, compressed = SCC(adj, adj_rev) adj_new = construct(adj, NN, compressed) in_num = [0] * (NN + 1) out_num = [0] * (NN + 1) for v in range(1, NN + 1): for u in adj_new[v]: in_num[u] += 1 out_num[v] += 1 if NN == 1: print(0) exit() seen = [0] * (NN+1) v0_list = [] plus_sum = minus_sum = 0 for v0 in range(1, NN+1): if seen[v0]: continue v0_list.append(v0) seen[v0] = 1 que = deque() que.append(v0) seq = [] while que: v = que.popleft() seq.append(v) for u in adj_new[v]: if seen[u] == 0: seen[u] = 1 que.append(u) p = s = 0 for v in seq: if in_num[v] == 0: p += 1 if out_num[v] == 0: s += 1 plus_sum += p minus_sum += s print(max(plus_sum, minus_sum)) if __name__ == '__main__': main()