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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#641870#6225. 生成树Elegia100 ✓134ms37704kbC++233.7kb2024-10-15 03:01:552024-10-15 03:01:55

Judging History

你现在查看的是最新测评结果

  • [2024-10-15 03:01:55]
  • 评测
  • 测评结果:100
  • 用时:134ms
  • 内存:37704kb
  • [2024-10-15 03:01:55]
  • 提交

answer

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*/
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <cctype>
 
#include <algorithm>
#include <tuple>
#include <random>
#include <bitset>
#include <queue>
#include <functional>
#include <set>
#include <map>
#include <vector>
#include <chrono>
#include <iostream>
#include <limits>
#include <numeric>

#define LOG(FMT...) fprintf(stderr, FMT)

#define fir first
#define sec second

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;

// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

template<class T>
istream &operator>>(istream &is, vector<T> &v) {
  for (T &x : v)
    is >> x;
  return is;
}

ostream &operator<<(ostream &os, const pair<char, int> &unit) {
  return os << unit.first << "^" << unit.second;
}

template<class T>
ostream &operator<<(ostream &os, const vector<T> &v) {
  if (!v.empty()) {
    os << v.front();
    for (int i = 1; i < v.size(); ++i)
      os << ' ' << v[i];
  }
  return os;
}

const int P = 998244353;

int norm(int x) { return x >= P ? x - P : x; }
void add(int& x, int y) { if ((x += y - P) < 0) x += P; }
void sub(int& x, int y) { if ((x -= y) < 0) x += P; }

struct Info {
  int lnk, iso;

  Info(int lnk = 0, int iso = 1) : lnk(lnk), iso(iso) {}
};

Info twist(const Info& a, const Info& b) {
  return Info((a.lnk * (ull)b.iso + b.lnk * (ull)a.iso) % P,
              a.iso * (ull)b.iso % P);
}

Info compress(const Info& a, const Info& b) {
  return Info(a.lnk * (ull)b.lnk % P,
              (a.lnk * (ull)b.iso + b.lnk * (ull)a.iso) % P);
}

int main() {
#ifdef ELEGIA
  freopen("test.in", "r", stdin);
  int nol_cl = clock();
#endif
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int n, m;
  cin >> n >> m;
  vector<map<int, Info>> g(n);
  while (m--) {
    int u, v;
    cin >> u >> v;
    --u; --v;
    g[u][v] = g[v][u] = twist(g[u][v], Info(1));
  }
  int ans = 1;
  queue<int> q;
  auto erase = [&](int u, int v) {
    g[u].erase(v);
    g[v].erase(u);
  };
  auto check = [&](int u) { if (g[u].size() <= 2) q.push(u); };
  for (int i = 0; i != n; ++i) check(i);
  while (!q.empty()) {
    int u = q.front(); q.pop();
    if (g[u].empty()) continue;
    if (g[u].size() == 1) {
      int v;
      Info info;
      tie(v, info) = *g[u].begin();
      erase(u, v);
      check(v);
      ans = ans * (ull)info.lnk % P;
    } else {
      int v, w;
      Info info, jnfo;
      tie(v, info) = *g[u].begin();
      tie(w, jnfo) = *next(g[u].begin());
      erase(u, v);
      erase(u, w);
      g[v][w] = g[w][v] = twist(g[v][w], compress(info, jnfo));
      check(v);
      check(w);
    }
  }
  cout << ans << '\n';

#ifdef ELEGIA
  LOG("Time: %dms\n", int ((clock()
      -nol_cl) / (double)CLOCKS_PER_SEC * 1000));
#endif
  return 0;
}

詳細信息

Subtask #1:

score: 10
Accepted

Test #1:

score: 10
Accepted
time: 1ms
memory: 3932kb

input:

1828 1828
277 1778
1778 1650
1650 1169
1778 1812
1169 1041
1650 662
662 1187
662 939
1041 224
224 1098
1169 497
1169 1443
224 1356
1169 719
662 781
1169 818
1041 514
1778 986
939 1721
818 1102
1098 1376
719 1028
818 1084
1812 79
1187 722
719 67
79 1816
1721 695
514 1458
781 696
79 656
224 159
1169 6...

output:

8

result:

ok single line: '8'

Test #2:

score: 10
Accepted
time: 1ms
memory: 3900kb

input:

1816 1816
123 240
123 1242
123 1055
240 521
1242 927
521 590
1055 1257
240 514
927 848
1257 603
590 1631
848 1419
1419 1502
603 1761
514 447
1502 609
603 313
313 1322
1631 1482
447 1361
609 1375
447 1624
1624 845
1322 9
1361 1290
1375 737
1624 1813
1290 1752
1290 586
586 933
933 1223
9 1144
1144 17
...

output:

111

result:

ok single line: '111'

Subtask #2:

score: 10
Accepted

Test #3:

score: 10
Accepted
time: 14ms
memory: 11840kb

input:

48897 49999
44175 43993
44175 13021
13021 23273
13021 35214
44175 43686
23273 25433
25433 46383
43686 45608
13021 26466
46383 13484
23273 28961
43686 21379
25433 46792
45608 16454
44175 3160
13484 16479
46792 39917
3160 11777
39917 30437
26466 19880
39917 29973
43686 43378
26466 40225
23273 38230
30...

output:

778245294

result:

ok single line: '778245294'

Test #4:

score: 10
Accepted
time: 20ms
memory: 11912kb

input:

46495 49999
18809 25060
18809 20105
25060 14021
14021 11908
20105 25840
20105 45172
11908 2540
45172 43458
25060 42642
14021 30673
25060 11344
11344 31485
20105 38798
20105 1297
11908 23
23 8876
14021 16485
43458 37234
42642 15882
31485 34755
25060 24921
25060 4755
30673 3332
38798 42105
24921 34288...

output:

246777581

result:

ok single line: '246777581'

Subtask #3:

score: 10
Accepted

Test #5:

score: 10
Accepted
time: 42ms
memory: 20716kb

input:

96912 99999
71789 3940
71789 21169
21169 50408
50408 68720
68720 67449
50408 69195
69195 64168
64168 70336
69195 81723
3940 91136
21169 75782
50408 36767
71789 77653
50408 30673
30673 79224
70336 4586
77653 32309
91136 57060
36767 3517
71789 16769
75782 11348
68720 46490
64168 15995
36767 51887
5040...

output:

373712628

result:

ok single line: '373712628'

Test #6:

score: 10
Accepted
time: 46ms
memory: 20400kb

input:

93838 99999
70859 84560
84560 47786
70859 28659
47786 68306
84560 30646
68306 74308
47786 17627
28659 23677
68306 13344
30646 41537
74308 81822
13344 68192
41537 78973
68192 39506
13344 39886
78973 81944
81944 77078
81944 81305
81305 78681
39886 48824
78681 31993
39506 54883
39886 49425
49425 45444
...

output:

839730642

result:

ok single line: '839730642'

Test #7:

score: 10
Accepted
time: 53ms
memory: 19872kb

input:

93217 99999
39897 48691
48691 70455
39897 66817
39897 25247
66817 34625
34625 59442
34625 82125
48691 66391
34625 70534
82125 27147
25247 28264
34625 59838
59442 69379
27147 68103
69379 22810
66391 15567
59838 15685
59838 71678
15567 28010
59838 7600
68103 69439
28010 15816
15685 39777
28010 44976
1...

output:

70137593

result:

ok single line: '70137593'

Subtask #4:

score: 10
Accepted

Test #8:

score: 10
Accepted
time: 53ms
memory: 20348kb

input:

92616 99999
70768 12420
70768 67024
70768 37650
67024 14933
12420 81054
81054 6944
70768 9552
14933 31629
70768 51744
81054 62067
31629 49539
51744 47773
9552 19607
81054 89603
6944 2797
81054 78691
70768 39322
37650 16268
31629 34316
78691 18322
70768 46861
70768 36460
9552 42042
51744 53292
53292 ...

output:

810112214

result:

ok single line: '810112214'

Test #9:

score: 10
Accepted
time: 47ms
memory: 20456kb

input:

94017 99999
24807 46668
24807 81260
81260 28843
24807 339
24807 85051
339 89974
85051 6774
89974 54730
6774 69479
85051 51263
85051 85168
85168 1149
1149 41024
54730 70391
6774 29667
29667 43389
70391 50356
70391 50688
29667 17145
41024 92883
92883 11499
92883 48754
92883 80483
11499 3362
92883 7241...

output:

73515925

result:

ok single line: '73515925'

Subtask #5:

score: 10
Accepted

Test #10:

score: 10
Accepted
time: 50ms
memory: 20456kb

input:

91653 99999
1786 58358
1786 87672
1786 62883
1786 56997
56997 79414
87672 56317
56997 30068
58358 43013
1786 25272
56317 11600
11600 57554
25272 37668
87672 30501
79414 1591
1591 74
30501 74650
57554 83362
87672 25595
1786 19541
25272 68790
30068 59157
19541 56546
79414 59557
79414 32173
56317 63887...

output:

396960248

result:

ok single line: '396960248'

Test #11:

score: 10
Accepted
time: 51ms
memory: 20380kb

input:

98027 99999
68700 70996
68700 70969
70996 87037
68700 31954
31954 76351
70969 67408
87037 30644
76351 74201
70969 95791
30644 57725
67408 67730
30644 9543
95791 17418
95791 36144
57725 89464
17418 96341
89464 95071
9543 80303
80303 75802
36144 28295
28295 13083
36144 94918
28295 36606
94918 97547
80...

output:

142117900

result:

ok single line: '142117900'

Subtask #6:

score: 10
Accepted

Test #12:

score: 10
Accepted
time: 56ms
memory: 20752kb

input:

98982 100000
37308 3159
37308 76920
37308 67591
67591 78501
76920 30922
67591 90524
3159 70630
67591 82536
70630 85743
70630 73885
85743 51097
82536 81427
70630 75802
82536 11006
75802 11893
82536 94161
75802 66471
51097 19126
19126 4071
75802 90741
75802 8924
66471 9660
8924 50226
50226 13970
50226...

output:

3947657

result:

ok single line: '3947657'

Test #13:

score: 10
Accepted
time: 54ms
memory: 20580kb

input:

92717 100000
88071 40013
40013 12184
88071 68384
88071 54188
40013 68412
68384 32761
12184 18940
32761 70231
70231 23569
68384 23421
54188 37005
32761 8334
23421 61868
32761 82547
70231 52689
23421 88714
18940 92131
40013 51926
40013 9007
51926 90144
32761 88549
32761 19068
12184 43987
54188 44910
8...

output:

572124101

result:

ok single line: '572124101'

Subtask #7:

score: 10
Accepted

Test #14:

score: 10
Accepted
time: 64ms
memory: 20696kb

input:

99170 100000
58553 14320
14320 9444
58553 22219
14320 77126
22219 32808
58553 62144
58553 72681
72681 72235
77126 74762
72681 95464
72235 70259
95464 18298
70259 63380
18298 88666
72235 65028
70259 26344
70259 39126
65028 38489
70259 54083
26344 28793
63380 82981
88666 94908
54083 15140
94908 21117
...

output:

259608098

result:

ok single line: '259608098'

Test #15:

score: 10
Accepted
time: 44ms
memory: 19892kb

input:

90629 100000
48443 18045
48443 41239
48443 51834
51834 87579
41239 35227
18045 10696
51834 86499
87579 85448
87579 37628
41239 73251
51834 9093
9093 64160
37628 69239
18045 36211
51834 84369
86499 20177
10696 77129
87579 41104
69239 85578
41104 15266
41104 24080
77129 64552
69239 16705
48443 78819
1...

output:

41632667

result:

ok single line: '41632667'

Subtask #8:

score: 10
Accepted

Test #16:

score: 10
Accepted
time: 81ms
memory: 29264kb

input:

148738 150000
97229 147704
147704 3732
3732 126210
147704 114875
97229 4145
114875 125662
126210 54609
126210 125530
125662 57240
3732 12701
114875 148509
125530 127724
57240 36638
54609 145259
125530 16588
16588 82269
148509 110113
12701 83842
145259 86308
36638 91488
110113 18954
86308 4751
18954 ...

output:

767723653

result:

ok single line: '767723653'

Test #17:

score: 10
Accepted
time: 93ms
memory: 28920kb

input:

138710 150000
53931 85292
85292 88589
53931 94589
85292 93632
94589 53422
53422 45414
93632 127800
45414 14891
45414 81869
88589 103316
85292 137429
53422 80797
53422 46149
85292 118979
53422 88912
81869 115796
115796 92856
53931 18436
45414 29822
127800 90152
90152 112533
46149 33694
45414 9543
534...

output:

376267810

result:

ok single line: '376267810'

Subtask #9:

score: 10
Accepted

Test #18:

score: 10
Accepted
time: 114ms
memory: 36764kb

input:

183279 200000
46233 1718
1718 145581
1718 99335
145581 149635
46233 44778
1718 7931
99335 14807
149635 86473
7931 50719
86473 86707
7931 138797
14807 106593
106593 28
86707 89350
106593 163773
106593 55983
89350 110272
89350 4686
4686 71136
110272 27450
110272 135707
71136 163719
110272 173695
71136...

output:

329641010

result:

ok single line: '329641010'

Test #19:

score: 10
Accepted
time: 134ms
memory: 36924kb

input:

184852 200000
143798 70410
143798 37446
37446 182726
182726 134625
143798 59164
59164 156722
70410 63575
134625 4665
37446 57518
156722 100315
4665 73340
73340 85752
59164 55342
143798 161481
63575 128530
63575 48989
85752 50513
143798 177429
59164 18324
37446 85571
70410 96780
48989 166166
48989 17...

output:

989875361

result:

ok single line: '989875361'

Subtask #10:

score: 10
Accepted

Test #20:

score: 10
Accepted
time: 110ms
memory: 37704kb

input:

193116 200000
94070 92162
92162 141789
141789 191032
94070 86611
141789 146661
141789 85085
94070 15000
85085 186121
146661 64671
85085 25108
186121 152468
15000 87079
87079 29491
64671 156412
29491 192599
64671 162723
25108 10551
87079 172614
172614 122064
162723 96437
96437 61867
156412 4076
61867...

output:

163752784

result:

ok single line: '163752784'

Test #21:

score: 10
Accepted
time: 118ms
memory: 36696kb

input:

184472 200000
97581 179943
179943 173014
173014 172243
173014 24977
97581 64985
179943 34565
24977 31528
173014 67095
67095 69368
179943 422
173014 22135
31528 151726
31528 23472
179943 122709
179943 162977
422 144423
67095 110563
31528 113571
22135 171376
113571 14174
179943 65293
69368 109387
1799...

output:

710341069

result:

ok single line: '710341069'