QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#388701#5828. 游戏Ecec243100 ✓207ms77476kbC++143.5kb2024-04-13 18:21:342024-04-13 18:21:34

Judging History

你现在查看的是最新测评结果

  • [2024-04-13 18:21:34]
  • 评测
  • 测评结果:100
  • 用时:207ms
  • 内存:77476kb
  • [2024-04-13 18:21:34]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N = 2e5+7;
struct edge
{
	int y,next;
}e[2*N];
int link[N],t=0;
void add(int x,int y)
{
	e[++t].y=y;
	e[t].next=link[x];
	link[x]=t;
}
namespace tree
{
	int dep[N],st[2*N][20],tot=0;
	int lg[2*N],dfn[N];
	void dfs(int x,int pre)
	{
		st[++tot][0]=x;
		dfn[x]=tot;
		for(int i=link[x];i;i=e[i].next)
		{
			int y=e[i].y;
			if(y==pre)continue;
			dep[y]=dep[x]+1;
			dfs(y,x);
			st[++tot][0]=x; 
		}
	}
	inline int Min(int x,int y)
	{
		return dep[x]<dep[y]?x:y;
	}
	void Build()
	{
		dfs(1,0);
		for(int i=2;i<=tot;i++)lg[i]=lg[i>>1]+1;
		for(int k=1;k<=lg[tot];k++)
		for(int i=1;i+(1<<k)-1<=tot;i++)
		st[i][k]=Min(st[i][k-1],st[i+(1<<(k-1))][k-1]);
	}
	inline int LCA(int x,int y)
	{
		x=dfn[x];y=dfn[y];
		if(x>y)swap(x,y);
		int k=lg[y-x+1];
		return Min(st[x][k],st[y-(1<<k)+1][k]);
	}
	inline int dist(int x,int y)
	{
		return dep[x]+dep[y]-2*dep[LCA(x,y)];
	}
}
int st,ed;
int n,m;
int A[N],B[N],fa[N];
void dfs(int x,int pre,int *D)
{
	for(int i=link[x];i;i=e[i].next)
	{
		int y=e[i].y;
		if(y==pre)continue;
		fa[y]=x;
		D[y]=D[x]+1;
		dfs(y,x,D);
	}
}
bool ins[N];
int seq[N];
int h[N];
void dfs2(int x,int pre)
{
	h[x]=0;
	for(int i=link[x];i;i=e[i].next)
	{
		int y=e[i].y;
		if(ins[y]||y==pre)continue;
		dfs2(y,x);
		h[x]=max(h[x],h[y]+1);
	}
}
int qoj[N],dfn[N];
int cnt=0;
void dfs3(int x,int pre)
{
	qoj[++cnt]=x;
	dfn[x]=cnt;
	for(int i=link[x];i;i=e[i].next)
	{
		int y=e[i].y;
		if(ins[y]||y==pre)continue;
		if(h[x]==h[y]+1)
		{
			dfs3(y,x);
			return;
		}
	}
}
int mx[N][20];
int lg[N];
inline int Max(int x,int y){return h[x]>h[y]?x:y;}
int x,y,z;
int query(int l,int r)
{
	int k=lg[r-l+1];
	return Max(mx[l][k],mx[r-(1<<k)+1][k]);
}
int dft[N];
bool check(int a,int b,int c)
{
	if(b==0) 
	{
		x=seq[1];
		y=seq[a+1];
		z=seq[a+c+1];
		return 1;
	}
	int l=a+1,r=m-c;
	if(l>r)return 0;
	int o=query(l,r);
	if(h[o]<b)return 0;
	x=seq[dft[o]-a];
	y=qoj[dfn[o]+b];
	z=seq[dft[o]+c];
	return 1;
}
bool check(int x,int y,int z,int u,int v,int w)
{
	if(tree::dist(x,y)!=u)return 0;
	if(tree::dist(x,z)!=v)return 0;
	if(tree::dist(z,y)!=w)return 0;
	return 1;
}
int main()
{
	cin>>n;
	for(int i=1;i<n;i++)
	{
		int u,v;
		scanf("%d %d",&u,&v);
		add(u,v);
		add(v,u);
	}
	tree::Build();
	dfs(1,0,A);
	for(int i=1;i<=n;i++)
	if(A[i]>A[st])st=i;
	fa[st]=0;
	dfs(st,0,B);
	for(int i=1;i<=n;i++)
	if(B[i]>B[ed])ed=i;
	int o=ed;
	while(o)
	{
		ins[o]=1;
		seq[++m]=o;
		dft[o]=m;
		o=fa[o];
	}
	for(int i=1;i<=m;i++)
	{
		dfs2(seq[i],0);
		dfs3(seq[i],0);
		mx[i][0]=seq[i];
	}
	for(int i=2;i<=m;i++)lg[i]=lg[i>>1]+1;
	for(int k=1;k<=lg[m];k++)
	for(int i=1;i+(1<<k)-1<=m;i++)
	mx[i][k]=Max(mx[i][k-1],mx[i+(1<<(k-1))][k-1]); 
	int q;
	cin>>q;
	while(q--)
	{
		int a,b,c;
		scanf("%d %d %d",&a,&b,&c);
		int u=a,v=b,w=c;
		bool flag=0;
		int d=(a+b+c)/2;
		a=d-a;b=d-b;c=d-c;
		if(!flag)flag|=check(a,b,c);
		if(!flag)flag|=check(a,c,b);
		if(!flag)flag|=check(b,a,c);
		if(!flag)flag|=check(b,c,a);
		if(!flag)flag|=check(c,a,b);
		if(!flag)flag|=check(c,b,a);
		if(check(x,y,z,u,v,w))printf("%d %d %d\n",x,y,z);
		else if(check(x,z,y,u,v,w))printf("%d %d %d\n",x,z,y);
		else if(check(y,x,z,u,v,w))printf("%d %d %d\n",y,x,z);
		else if(check(y,z,x,u,v,w))printf("%d %d %d\n",y,z,x);
		else if(check(z,x,y,u,v,w))printf("%d %d %d\n",z,x,y);
		else if(check(z,y,x,u,v,w))printf("%d %d %d\n",z,y,x);
		else printf("-1\n");
	}
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 10
Accepted
time: 0ms
memory: 3948kb

input:

500
279 196
182 105
400 14
278 217
198 411
379 318
120 421
314 95
437 325
23 433
71 485
192 154
90 224
180 71
328 93
183 101
404 349
223 285
492 100
366 480
29 328
200 448
365 156
226 231
129 167
246 273
171 452
284 6
131 471
229 90
480 48
448 157
240 221
7 36
401 200
255 438
436 110
281 489
388 258...

output:

421 175 463
421 47 239
361 376 209
343 175 350
436 420 57
461 184 57
343 450 431
158 126 202
179 39 93
120 473 165
215 47 391
215 362 463
401 171 57
311 370 328
125 90 209
49 243 391
306 473 478
60 417 476
253 148 493
158 47 292
47 50 110
211 169 452
361 73 403
17 169 113
487 215 452
110 399 431
37 ...

result:

ok Accepted!

Test #2:

score: 10
Accepted
time: 0ms
memory: 4372kb

input:

2000
643 1871
689 23
1822 1443
1031 1027
1655 845
189 771
1561 498
19 1778
576 1080
904 717
1690 291
1387 1077
398 811
1310 1231
645 1291
480 927
330 170
1464 1057
1033 894
1308 288
1292 1529
1212 122
1108 401
89 1118
1058 1088
1764 1314
981 1255
1893 864
180 1887
1903 843
734 1412
883 1013
1739 124...

output:

1227 1443 324
528 898 1026
886 230 324
870 769 1000
692 1343 1533
109 461 1118
1995 506 1026
1030 1846 1672
1390 389 464
339 1819 1301
29 692 1414
836 413 471
1574 910 1050
1201 572 152
664 572 722
158 898 1845
1001 898 1227
989 1846 666
652 1950 1672
1848 1279 1220
1480 401 145
1366 436 1630
1431 2...

result:

ok Accepted!

Test #3:

score: 10
Accepted
time: 114ms
memory: 48108kb

input:

200000
56968 132021
105656 107536
123627 58349
119191 138198
133708 142638
114350 24980
137784 40346
124158 130204
80684 183207
78156 94449
21893 157560
54464 73571
145830 57756
160288 32120
178632 142663
26565 185985
70576 24906
32217 115826
185756 137673
54280 179613
77826 144447
66005 29955
11745...

output:

87763 143809 44962

result:

ok Accepted!

Test #4:

score: 10
Accepted
time: 122ms
memory: 48132kb

input:

200000
41999 100683
85781 129266
122431 179332
162416 44814
24405 42267
154161 12483
178049 159964
67625 152391
133072 25866
178005 14695
94384 170290
54701 40323
66280 128515
159022 55057
14985 12920
182805 40659
173117 67973
99771 26102
198919 94543
23608 187601
61125 5759
89437 47647
18142 192402...

output:

174571 176688 95506

result:

ok Accepted!

Test #5:

score: 10
Accepted
time: 134ms
memory: 48124kb

input:

200000
195072 75458
31991 127114
60943 49502
186375 1130
45394 147217
168455 84307
132752 188952
101108 130004
107490 22003
16275 187645
111002 42669
138880 137115
112688 172751
81697 99037
166996 18495
2234 56119
170807 101349
105736 23180
148159 40863
136678 11849
190707 91245
61779 120740
157115 ...

output:

34411 98198 27046
39355 49857 70450
52145 64637 69064
129196 118391 75453
96028 146165 32236
194867 26201 124636
193249 106205 151320
36173 44996 147780
16928 10582 147134
197158 106757 196326

result:

ok Accepted!

Test #6:

score: 10
Accepted
time: 138ms
memory: 47868kb

input:

200000
48556 78408
155026 9376
8983 61211
150393 85068
90892 109283
75746 89742
6760 187245
168658 130735
68602 127646
60802 149828
22898 59471
172845 100274
42303 190696
7612 134905
94702 59800
129633 192496
19903 64869
51318 63358
34692 66030
98535 176606
153647 177529
157903 147292
106273 107278
...

output:

145500 7480 3363
156481 27494 156628
134802 59297 136664
126929 139436 4472
79250 92990 19984
31684 19769 84929
77495 50600 148651
49868 10494 79717
12157 105707 36244
82672 50225 155540

result:

ok Accepted!

Test #7:

score: 10
Accepted
time: 183ms
memory: 77476kb

input:

200000
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
30 31
31 32
32 33
33 34
34 35
35 36
36 37
37 38
38 39
39 40
40 41
41 42
42 43
43 44
44 45
45 46
46 47
47 48
48 49
49 50
50 51
51 52
52 5...

output:

145645 1 62949
68760 38957 1
115484 1 20705
16671 36782 1
41631 1 5656
114616 28131 1
58614 114785 1
171869 94241 1
174290 1 131964
175188 154225 1
142541 139642 1
82073 21712 1
20583 1 16556
177239 83956 1
99183 1 8150
94979 12843 1
136758 117147 1
93202 1 55604
9655 26120 1
70963 1 31750
28190 956...

result:

ok Accepted!

Test #8:

score: 10
Accepted
time: 180ms
memory: 48084kb

input:

200000
5732 55198
128966 25317
114737 116391
150003 18274
43867 70745
76222 4169
55976 114951
198396 72896
38647 19711
12756 172119
73197 117994
117512 14177
130965 126990
119440 183341
142023 60829
111893 57350
122754 123305
36525 79077
36447 91967
135405 170456
165839 147481
66074 175822
22238 264...

output:

183543 183543 178310
98115 98115 178310
36778 36778 178310
30537 30537 178310
169883 169883 178310
65826 65826 178310
31265 31265 178310
161066 161066 178310
129717 129717 178310
85 85 178310
98442 98442 178310
118809 118809 178310
183881 183881 178310
87348 87348 178310
186490 186490 178310
113946 ...

result:

ok Accepted!

Test #9:

score: 10
Accepted
time: 207ms
memory: 47968kb

input:

200000
185063 17064
180987 114492
88071 71803
158363 135918
60910 54848
97338 6734
192937 9410
49617 199068
82499 63554
188791 188152
178767 40866
11304 27212
144234 138097
42236 3946
103355 12683
50992 20598
145723 48620
11709 115688
123172 121379
70541 130844
147827 39431
139372 61280
42705 54015
...

output:

80097 34708 81596
66894 186401 42045
184795 95044 140544
165046 161190 15891
66610 181723 196866
119681 139020 117148
113149 177939 151070
83964 136800 199684
99848 193733 165590
75873 99034 182287
119888 44210 197331
44224 98649 113772
151223 59119 34254
3957 69646 19165
82137 122318 79516
99825 12...

result:

ok Accepted!

Test #10:

score: 10
Accepted
time: 203ms
memory: 48036kb

input:

200000
197244 185999
18639 124754
154223 12099
53676 167616
22710 22294
150412 66132
19320 75478
170410 122661
130961 175554
171586 85572
188386 81238
120249 117687
43214 126266
8744 165654
164725 189519
124144 170329
86605 100197
130545 17030
113301 96665
67733 187286
37846 146399
75352 117550
3235...

output:

46612 115995 19487
74523 185226 99574
113594 85322 143204
25740 146957 128773
184978 89001 83393
163893 65929 94172
130689 180089 195057
166586 159412 123029
21175 139139 181742
134043 51547 126401
3992 160570 172760
17316 110479 168064
77703 8619 156309
95660 178898 38381
55180 67418 171987
100828 ...

result:

ok Accepted!

Extra Test:

score: 0
Extra Test Passed