結果

問題 No.1254 補強への架け橋
ユーザー brthyyjpbrthyyjp
提出日時 2020-10-09 23:02:46
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 332 ms / 2,000 ms
コード長 1,743 bytes
コンパイル時間 308 ms
コンパイル使用メモリ 81,584 KB
実行使用メモリ 133,696 KB
最終ジャッジ日時 2024-07-20 13:51:20
合計ジャッジ時間 22,991 ms
ジャッジサーバーID
(参考情報)
judge1 / judge3
このコードへのチャレンジ
(要ログイン)

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 37 ms
52,352 KB
testcase_01 AC 37 ms
52,224 KB
testcase_02 AC 37 ms
52,480 KB
testcase_03 AC 37 ms
52,096 KB
testcase_04 AC 37 ms
52,224 KB
testcase_05 AC 38 ms
52,608 KB
testcase_06 AC 38 ms
52,224 KB
testcase_07 AC 39 ms
52,608 KB
testcase_08 AC 38 ms
52,352 KB
testcase_09 AC 37 ms
52,480 KB
testcase_10 AC 37 ms
52,352 KB
testcase_11 AC 38 ms
52,196 KB
testcase_12 AC 38 ms
51,968 KB
testcase_13 AC 38 ms
52,736 KB
testcase_14 AC 42 ms
52,608 KB
testcase_15 AC 38 ms
52,608 KB
testcase_16 AC 40 ms
52,480 KB
testcase_17 AC 38 ms
52,096 KB
testcase_18 AC 39 ms
52,736 KB
testcase_19 AC 39 ms
52,480 KB
testcase_20 AC 39 ms
52,992 KB
testcase_21 AC 39 ms
52,096 KB
testcase_22 AC 40 ms
52,352 KB
testcase_23 AC 38 ms
52,224 KB
testcase_24 AC 38 ms
52,864 KB
testcase_25 AC 39 ms
52,736 KB
testcase_26 AC 39 ms
52,736 KB
testcase_27 AC 39 ms
52,864 KB
testcase_28 AC 40 ms
52,608 KB
testcase_29 AC 38 ms
52,224 KB
testcase_30 AC 38 ms
52,608 KB
testcase_31 AC 39 ms
52,480 KB
testcase_32 AC 37 ms
52,224 KB
testcase_33 AC 38 ms
52,736 KB
testcase_34 AC 38 ms
52,608 KB
testcase_35 AC 37 ms
52,736 KB
testcase_36 AC 38 ms
52,608 KB
testcase_37 AC 40 ms
52,864 KB
testcase_38 AC 39 ms
52,608 KB
testcase_39 AC 37 ms
52,352 KB
testcase_40 AC 38 ms
52,736 KB
testcase_41 AC 38 ms
52,864 KB
testcase_42 AC 37 ms
52,864 KB
testcase_43 AC 50 ms
61,824 KB
testcase_44 AC 39 ms
53,632 KB
testcase_45 AC 41 ms
53,120 KB
testcase_46 AC 48 ms
60,800 KB
testcase_47 AC 42 ms
54,272 KB
testcase_48 AC 48 ms
60,416 KB
testcase_49 AC 38 ms
52,736 KB
testcase_50 AC 51 ms
62,976 KB
testcase_51 AC 49 ms
62,592 KB
testcase_52 AC 51 ms
62,336 KB
testcase_53 AC 49 ms
61,440 KB
testcase_54 AC 51 ms
62,080 KB
testcase_55 AC 51 ms
61,824 KB
testcase_56 AC 39 ms
52,992 KB
testcase_57 AC 46 ms
59,520 KB
testcase_58 AC 47 ms
60,928 KB
testcase_59 AC 39 ms
52,608 KB
testcase_60 AC 41 ms
53,632 KB
testcase_61 AC 49 ms
61,696 KB
testcase_62 AC 40 ms
52,864 KB
testcase_63 AC 120 ms
79,360 KB
testcase_64 AC 90 ms
77,336 KB
testcase_65 AC 109 ms
78,604 KB
testcase_66 AC 101 ms
77,636 KB
testcase_67 AC 85 ms
76,928 KB
testcase_68 AC 105 ms
78,120 KB
testcase_69 AC 114 ms
78,468 KB
testcase_70 AC 97 ms
77,392 KB
testcase_71 AC 90 ms
77,056 KB
testcase_72 AC 112 ms
78,644 KB
testcase_73 AC 95 ms
77,292 KB
testcase_74 AC 116 ms
78,932 KB
testcase_75 AC 105 ms
77,540 KB
testcase_76 AC 69 ms
71,040 KB
testcase_77 AC 99 ms
78,056 KB
testcase_78 AC 116 ms
79,288 KB
testcase_79 AC 116 ms
79,232 KB
testcase_80 AC 110 ms
78,864 KB
testcase_81 AC 120 ms
79,260 KB
testcase_82 AC 111 ms
79,132 KB
testcase_83 AC 327 ms
133,696 KB
testcase_84 AC 326 ms
125,988 KB
testcase_85 AC 232 ms
109,808 KB
testcase_86 AC 281 ms
117,808 KB
testcase_87 AC 302 ms
123,996 KB
testcase_88 AC 122 ms
81,228 KB
testcase_89 AC 317 ms
126,516 KB
testcase_90 AC 229 ms
107,684 KB
testcase_91 AC 203 ms
102,060 KB
testcase_92 AC 149 ms
89,212 KB
testcase_93 AC 279 ms
115,936 KB
testcase_94 AC 256 ms
111,876 KB
testcase_95 AC 257 ms
111,628 KB
testcase_96 AC 299 ms
124,960 KB
testcase_97 AC 190 ms
97,120 KB
testcase_98 AC 296 ms
125,012 KB
testcase_99 AC 217 ms
107,764 KB
testcase_100 AC 332 ms
132,620 KB
testcase_101 AC 142 ms
87,328 KB
testcase_102 AC 119 ms
80,940 KB
testcase_103 AC 149 ms
89,196 KB
testcase_104 AC 166 ms
92,432 KB
testcase_105 AC 267 ms
117,624 KB
testcase_106 AC 190 ms
99,688 KB
testcase_107 AC 332 ms
128,768 KB
testcase_108 AC 314 ms
128,392 KB
testcase_109 AC 273 ms
117,000 KB
testcase_110 AC 250 ms
111,712 KB
testcase_111 AC 248 ms
113,376 KB
testcase_112 AC 162 ms
92,108 KB
testcase_113 AC 256 ms
111,092 KB
testcase_114 AC 184 ms
97,344 KB
testcase_115 AC 122 ms
81,408 KB
testcase_116 AC 203 ms
102,544 KB
testcase_117 AC 168 ms
92,100 KB
testcase_118 AC 299 ms
124,668 KB
testcase_119 AC 211 ms
101,508 KB
testcase_120 AC 308 ms
123,932 KB
testcase_121 AC 154 ms
89,048 KB
testcase_122 AC 213 ms
101,664 KB
testcase_123 AC 38 ms
51,968 KB
testcase_124 AC 305 ms
121,592 KB
testcase_125 AC 308 ms
121,464 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 #

def lowlink(g, root=0):
    n = len(g)
    order = [n]*n
    low = [n]*n

    s = [root]
    cnt = 0
    par = [-1]*n
    seq = []
    while s:
        v = s.pop()
        if order[v] != n:
            continue
        order[v] = cnt
        seq.append(v)
        low[v] = cnt
        cnt += 1
        for u in g[v]:
            if order[u] < cnt:
                if par[v] != u:
                    low[v] = min(low[v], order[u])
                    continue
            else:
                par[u] = v
                s.append(u)
    child = [[] for _ in range(n)]
    for v in range(n):
        if par[v] != -1:
            child[par[v]].append(v)
    seq.reverse()
    for v in seq:
        for u in child[v]:
            low[v] = min(low[v], low[u])
    # bridge
    bridge = []
    for p in range(n):
        for c in child[p]:
            if order[p] < low[c]:
                bridge.append((p, c))

    # articulation points
    AP = []
    for v in range(n):
        if v == root:
            if len(child[v]) >= 2:
                AP.append(v)
        else:
            for c in child[v]:
                if order[v] <= low[c]:
                    AP.append(v)
                    break
    return AP, bridge

import sys
import io, os
input = sys.stdin.buffer.readline

n = int(input())
g = [[] for _ in range(n)]
d = {}
for i in range(n):
    a, b = map(int, input().split())
    a, b = a-1, b-1
    if a > b:
        a, b = b, a
    g[a].append(b)
    g[b].append(a)
    d[(a, b)] = i
#print(d)
_, bridge = lowlink(g, 0)
s = set()
for u, v in bridge:
    if u > v:
        u, v = v, u
    s.add((u, v))

res = []
for k, v in d.items():
    if k in s:
        continue
    else:
        res.append(v+1)
print(len(res))
print(*res)
0