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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
#321992#7607. The Doubling Game 2huazai676TL 24ms266172kbC++201.5kb2024-02-06 00:26:272024-04-10 01:47:00

Judging History

你现在查看的是最新测评结果

  • [2024-04-10 01:47:00]
  • 管理员手动重测该提交记录
  • 测评结果:TL
  • 用时:24ms
  • 内存:266172kb
  • [2024-02-06 00:26:27]
  • 提交

answer

#pragma GCC optimize("Ofast")
#include<iostream>
#include<cstring>
#include<algorithm>
#include<vector>

using namespace std;

typedef long long ll;

const int N=3e5+10,mod=1e9+7;

int n,ans[N];
vector<int> T[N],f[N],g[N];

void add(int &x,ll y)
{
	x+=y%mod;
	if(x>=mod) x-=mod;
}

void dfs(int u,int fa)
{
	for(int v:T[u]) if(v!=fa) dfs(v,u);
	vector<int> f1(2),g1(2);
	f1[0]=1;
	int sz=0;
	sort(T[u].begin(),T[u].end(),[](int x,int y){return f[x].size()<f[y].size();});
	for(int v:T[u])
	{
		if(v==fa) continue;
		vector<int> f2(1<<(f[v].size())),g2(1<<(f[v].size()));
		for(int i=0;i<(1<<sz);i++)
		{
			add(f2[i],1LL*f1[i]*ans[v]),add(g2[i],1LL*g1[i]*ans[v]);
			for(int j=0;j<f[v].size();j++)
			{
				if((i>>j)&1) continue;
				add(f2[i|(1<<j)],1LL*f1[i]*f[v][j]);
				if((1<<j)>i) add(g2[i|(1<<j)],1LL*f1[i]*g[v][j]);
				else add(g2[i|(1<<j)],1LL*g1[i]*f[v][j]);
			}
		}
		swap(f1,f2),swap(g1,g2);
		sz=f[v].size();
		vector<int>().swap(f2),vector<int>().swap(g2);
	}
	f[u].resize(sz+1),g[u].resize(sz+1);
	for(int i=0;i<=sz;i++)
	{
		int s=(1<<i)-1;
		add(ans[u],f1[s]+g1[s]);
		add(f[u][i],f1[s]),add(g[u][i],f1[s]);
		for(int j=0;j<i-1;j++) add(g[u][j],f1[s^(1<<j)]+g1[s^(1<<j)]);
	}
//	while(!f[u].back()&&!g[u].back()) f[u].pop_back(),g[u].pop_back();
}

int main()
{
	ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i=1;i<n;i++)
	{
		int u,v;
		cin>>u>>v;
		T[u].push_back(v),T[v].push_back(u);
	}
	dfs(1,0);
	cout<<ans[1];
	
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 2ms
memory: 3780kb

input:

5
1 2
1 3
1 4
4 5

output:

21

result:

ok single line: '21'

Test #2:

score: 0
Accepted
time: 0ms
memory: 3576kb

input:

1

output:

1

result:

ok single line: '1'

Test #3:

score: 0
Accepted
time: 2ms
memory: 3624kb

input:

128
11 32
116 81
65 4
117 47
5 81
104 30
61 8
82 59
95 20
92 29
29 127
97 39
123 33
59 128
115 33
83 67
74 16
77 33
64 73
124 123
8 127
61 51
101 122
35 90
119 116
112 27
81 93
109 123
54 1
119 100
116 16
65 47
67 27
22 105
76 87
36 39
27 96
72 31
91 123
21 105
118 12
110 48
121 72
14 115
24 16
106 ...

output:

508800953

result:

ok single line: '508800953'

Test #4:

score: 0
Accepted
time: 2ms
memory: 3932kb

input:

256
53 177
57 242
74 90
107 104
209 169
132 70
152 142
71 168
143 99
91 130
202 140
49 165
209 193
209 137
159 188
247 48
49 21
20 208
155 185
120 231
83 87
37 84
143 18
106 8
114 79
191 158
208 256
133 252
215 92
199 108
166 168
39 217
85 69
204 139
100 75
111 6
230 198
79 130
26 155
155 38
55 81
1...

output:

999869740

result:

ok single line: '999869740'

Test #5:

score: 0
Accepted
time: 3ms
memory: 4040kb

input:

512
507 193
168 152
48 369
273 170
101 349
160 261
438 197
446 224
125 264
210 131
272 218
361 85
226 119
57 33
229 89
37 317
130 417
30 470
435 300
499 417
132 260
196 430
119 117
157 260
207 151
368 277
188 371
214 330
484 228
96 94
97 442
251 461
443 248
163 207
306 147
346 90
457 112
436 222
364...

output:

37387055

result:

ok single line: '37387055'

Test #6:

score: 0
Accepted
time: 4ms
memory: 36152kb

input:

1024
340 598
1 851
245 819
414 736
996 316
300 284
924 407
532 557
362 178
1006 469
397 373
742 77
112 37
406 892
703 666
496 825
1002 100
875 856
263 975
227 6
288 389
661 437
160 626
833 770
912 837
405 628
466 686
45 629
59 13
163 991
1017 422
208 247
344 376
709 956
570 272
996 954
518 454
267 3...

output:

689180079

result:

ok single line: '689180079'

Test #7:

score: 0
Accepted
time: 3ms
memory: 7752kb

input:

2048
2046 1942
589 1449
1593 1983
936 414
387 184
1962 1237
1986 635
573 1619
1598 1109
458 836
1123 1563
1502 519
1467 347
1815 864
980 405
709 433
1682 211
1967 1915
1089 1902
564 211
128 1004
1568 315
293 494
1552 1772
1641 1157
431 1899
1334 1623
161 1870
885 1330
1863 502
1761 1643
692 1759
118...

output:

275839338

result:

ok single line: '275839338'

Test #8:

score: 0
Accepted
time: 11ms
memory: 266172kb

input:

4096
2546 3568
3084 3426
1262 2128
1773 1455
425 3750
3444 3265
3099 464
3479 3651
639 1727
2486 2768
1165 1905
1847 2626
1335 3938
2550 1594
1520 1758
3771 2227
3486 60
381 383
1268 2829
1884 3468
3195 2892
983 31
584 2599
2811 1876
1875 3310
3184 2941
2893 202
1305 1926
1019 1639
3529 1998
2129 12...

output:

99235843

result:

ok single line: '99235843'

Test #9:

score: 0
Accepted
time: 24ms
memory: 37732kb

input:

8192
5663 2164
3712 1600
336 2388
1971 4169
1579 7319
496 8080
5305 982
5508 5777
5324 6680
4636 6745
7295 6086
6948 388
5239 811
1875 7271
5755 2864
2933 795
6448 6716
3016 302
2474 2937
6355 5936
4973 4064
2920 2318
6254 4090
665 2500
961 8180
5416 6371
4958 5430
7905 5013
4373 3068
6557 3867
3056...

output:

79832799

result:

ok single line: '79832799'

Test #10:

score: -100
Time Limit Exceeded

input:

16384
4535 8823
5344 1240
5793 15361
8423 14130
14595 11420
12195 1332
9712 4829
9533 14608
1328 14962
13846 1173
12823 5702
3518 9298
3235 13113
14312 3915
3439 9003
4667 5401
3819 2395
13827 981
3557 11804
7369 11344
15524 1435
4706 15539
12838 2109
4986 5367
2766 4313
6802 12338
12059 3998
6327 5...

output:


result: