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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#109991#6404. Shuttle Tourgrass8cowAC ✓2927ms46168kbC++142.7kb2023-05-31 09:16:492023-05-31 09:16:50

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-05-31 09:16:50]
  • 评测
  • 测评结果:AC
  • 用时:2927ms
  • 内存:46168kb
  • [2023-05-31 09:16:49]
  • 提交

answer

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll d[201000];
int fa[201000],top[201000],sz[201000],dfn[201000],n,q,bel[200100];
struct ed{int v,w;};
vector<ed>g[200100];
int son[201000],a[201000],di[200100];
char C[200100];
#define pb push_back
void dfs(int x){
	sz[x]=1;int mt=-1; 
	for(ed t:g[x])if(t.v!=fa[x]){
		fa[t.v]=x,d[t.v]=d[x]+t.w,di[t.v]=di[x]+1,dfs(t.v),sz[x]+=sz[t.v];
		if(mt<sz[t.v])mt=sz[t.v],son[x]=t.v;
	}
}
int lca(int a,int b){
	if(a==-1)return b;
	if(b==-1)return a;
	while(top[a]!=top[b]){
		if(di[top[a]]<di[top[b]])swap(a,b);
		a=fa[top[a]];
	}
	if(di[a]>di[b])swap(a,b);return a;
}
vector<int>zb;
void dfs2(int x,int ff){
	top[x]=ff,bel[dfn[x]=++dfn[0]]=x;
	if(x==top[x])zb.pb(x);
	if(!son[x])return;
	dfs2(son[x],ff);
	for(ed t:g[x])if(t.v!=son[x]&&t.v!=fa[x])dfs2(t.v,t.v);
}
int lc[800100];
void build(int p,int l,int r){
	if(l==r){lc[p]=(a[l]?l:-1);return;}
	int mid=(l+r)>>1;
	build(p<<1,l,mid),build(p<<1|1,mid+1,r);
	lc[p]=lca(lc[p<<1],lc[p<<1|1]); 
}
void ud(int p,int l,int r,int x){
	if(l==r){lc[p]=(a[l]?l:-1);return;}
	int mid=(l+r)>>1;
	if(x<=mid)ud(p<<1,l,mid,x);
	else ud(p<<1|1,mid+1,r,x);
	lc[p]=lca(lc[p<<1],lc[p<<1|1]);
}
int as(int p,int l,int r,int x,int y){
	if(y<l||x>r||lc[p]==-1)return -1;
	if(x<=l&&r<=y)return lc[p];int mid=(l+r)>>1;
	return lca(as(p<<1,l,mid,x,y),as(p<<1|1,mid+1,r,x,y));
}
int T[201000],cn,ls[20010000],rs[20010000],mx[20100000];
void up(int &o,int l,int r,int x,int z){
	if(!o)o=++cn;
	if(l==r){mx[o]=z;return;}
	int mid=(l+r)>>1;if(x<=mid)up(ls[o],l,mid,x,z);
	else up(rs[o],mid+1,r,x,z);
	mx[o]=max(mx[ls[o]],mx[rs[o]]);
}
int ask(int p,int l,int r,int x,int y){
	if(y<l||x>r||!p)return 0;
	if(x<=l&&r<=y)return mx[p];
	int mid=(l+r)>>1;
	return max(ask(ls[p],l,mid,x,y),ask(rs[p],mid+1,r,x,y));
}
int main(){
	scanf("%d%d%s",&n,&q,C+1);
	for(int i=1;i<=n;i++)a[i]=C[i]-'0';
	for(int i=1,u,v,w;i<n;i++){
		scanf("%d%d%d",&u,&v,&w);
		g[u].pb((ed){v,w}),g[v].pb((ed){u,w});
	}
	dfs(1),dfs2(1,1);
	build(1,1,n);
	for(int x=1;x<=n;x++)if(a[x]){
		int u=x;
		while(u)up(T[top[u]],1,n,x,dfn[u]),u=fa[top[u]];
	}
	//维护区间最大值。 
	for(int i=1,op,l,r,x;i<=q;i++){
		scanf("%d",&op);
		if(op==2){
			//对于每个链维护出来最大的被搞的点
			scanf("%d%d",&l,&r);int u=as(1,1,n,l,r);
			if(u==-1)puts("-1");
			else{
				ll ans=-d[u];
				for(int x:zb){
					int si=ask(T[x],1,n,l,r);
					if(si>0)ans+=d[bel[si]]-d[fa[x]];
				}
				printf("%lld\n",ans*2);
			}
		}
		else{
			scanf("%d",&x),a[x]^=1;
			ud(1,1,n,x);int u=x;
			while(u)up(T[top[u]],1,n,x,a[x]?dfn[u]:0),u=fa[top[u]];
		}
	} 
	return 0;
} 

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 4ms
memory: 13884kb

input:

5 6
10110
1 2 1
1 3 10
2 4 100
3 5 1000
2 1 5
1 3
2 1 5
2 2 4
2 5 5
2 1 1

output:

222
202
0
-1
0

result:

ok 5 number(s): "222 202 0 -1 0"

Test #2:

score: 0
Accepted
time: 172ms
memory: 10424kb

input:

50 200000
00100100100001101010110100000111100011101110011010
14 47 940241413
11 43 331483591
37 38 496247070
47 46 832459694
7 15 16479291
1 30 402388666
30 8 513064064
46 50 739311480
5 4 761894947
32 41 631669659
17 24 715786564
35 20 763151642
32 33 492466005
39 11 186023146
9 7 805081251
3 42 25...

output:

17149847378
-1
26540740138
29613692754
21307948558
27003443184
11893407374
18332625722
20412196350
20281573062
29727468956
9593307160
9380710234
23682775470
16688997988
2856655228
14982588156
0
-1
9140136614
26193602866
22558599316
24807163344
19126284190
8533875940
7695830712
18079494744
0
27004673...

result:

ok 100000 numbers

Test #3:

score: 0
Accepted
time: 128ms
memory: 12104kb

input:

50 200000
10010001110011101101101011010011100101101010111001
1 25 560163135
2 7 696374536
33 39 14485266
39 22 456690113
4 5 267811886
18 6 657680382
3 43 865617406
25 14 885515220
41 34 919525052
42 50 410634144
8 3 487403277
3 30 701549676
2 43 54223104
7 34 691078766
14 23 323352590
26 48 4936558...

output:

17177676326
31373486130
15290175638
8192974494
22734716092
27802380120
6315957348
0
15780401446
15929384564
26423899248
9639532596
21199366790
26413065782
-1
29063665908
29925313598
28651879288
17144176262
16526083688
28206620550
26873163342
14840246174
32414950818
29985336496
0
11937422088
11131990...

result:

ok 100000 numbers

Test #4:

score: 0
Accepted
time: 133ms
memory: 9832kb

input:

50 200000
01011001001010000100001101100111011001101011101000
34 29 654100339
33 5 947063765
45 25 962067151
11 13 509130797
26 47 988757358
49 22 75267557
7 11 431530851
46 1 531969122
22 43 449891945
34 6 526679193
50 17 499004364
22 23 226725950
26 48 203414490
11 44 900725507
10 29 451714017
35 2...

output:

24080362406
0
0
21418182584
28358635244
28257750030
24520294678
21418182584
0
15335211126
28621468542
18664505530
19335499776
32374868794
23618866752
26801803500
24116134918
27676993638
30222353942
25612316674
20504702130
28400398734
29472795250
24400110084
20586186786
25612316674
0
30067400886
1297...

result:

ok 100000 numbers

Test #5:

score: 0
Accepted
time: 4ms
memory: 12104kb

input:

2 10
01
1 2 340134039
2 1 2
1 1
2 1 2
1 2
2 1 1
1 2
2 2 2
1 2
2 2 2
1 1

output:

0
680268078
0
0
-1

result:

ok 5 number(s): "0 680268078 0 0 -1"

Test #6:

score: 0
Accepted
time: 175ms
memory: 42776kb

input:

200000 100
1100001001001101010000111111011011101010001011011011011010101111010001111010101100101001010000110100100011111010011100101010010001011010111100101110010000101010000100111100000011001100111101110011000011010011011011100101100111101010111101110111001111111010001010010000110110100000111000111...

output:

187263442365796
187267199881816
187176203274470
187269896250018
187239740690858
186974761323092
187257776119514
187269896250018
187035239640930
186911636122472
187263030332128
187121605387264
187264313877130
187263442365796
187269896250018
187249588971104
187263442365796
187263442365796
187264313877...

result:

ok 50 numbers

Test #7:

score: 0
Accepted
time: 164ms
memory: 43680kb

input:

200000 100
1000100001000101011000010111101000110001110111010000000010100100001110001110011001001011000010001000101111000111000100111101111111011111101101011110010101110000011011000101010000101110000100101000101110011111110000010011010010001001010001101000001111001001011111110100100011011100010100101...

output:

187406582272754
187713357625510
187713357625510
187710409039730
187708440524170
187705546874918
187675370061160
187696435101958
187704004975728
187708440524170
187708440524170
187490194913408
186797006090958
187708440524170
187708440524170
187694259450196
187691068337432
187699562335668
187708440524...

result:

ok 50 numbers

Test #8:

score: 0
Accepted
time: 194ms
memory: 40788kb

input:

200000 100
1101110101111010101100101110111101001010101100011111011010101101001011000101011011110110110001000000110000100110101010001011100110100101010110001111000100011010101011100011111010111001011110110001001010000001010100000000100010010000110100101010000111010100100111001011101001000011010101011...

output:

187071935465024
186902015424650
186944515923806
187083386398370
187083386398370
186176053533638
187210565613960
186840136921858
187059112646348
186963648681914
187157614978100
187171857507720
186687953621656
187037985042418
184267618052908
185811051686090
186716949587794
186666528269428
186754258305...

result:

ok 50 numbers

Test #9:

score: 0
Accepted
time: 2410ms
memory: 44776kb

input:

200000 200000
1010011001010010101000001000111111110110111100000011000110010101000001101110111000100011010101100011001011101100010100000010100000100110100001000111010000011001010111001001000000111001100110010100101010111000000000011110101110010101110110110101100001011001101010101001000010000010000000...

output:

185874943612396
186901189463748
185325592077116
187007806200644
185723936146376
186683200699722
186830061692652
186256265895174
186860903405924
186810412385682
186744028102060
186994420108608
186831837842360
180459525430870
186966649455016
186952309712742
185810351127924
186849618327982
186494273101...

result:

ok 100000 numbers

Test #10:

score: 0
Accepted
time: 2927ms
memory: 45452kb

input:

200000 200000
1101100101010001011001101010110111010000001100111000100010001111101101110111001101000001101011010000001110101101001010011000001011000101010111001101100100101001100111010001101010011100101100010110000011110101101011000011101101010111101000000111100100011101000110011100011000010010001011...

output:

187559700459682
187535810670694
187366757549978
187509694959444
186405180245408
187572993046976
186802217032708
186278525122374
187171989295434
187404069323808
187366390326582
184670301024044
186230793287498
187530780070456
187597311483370
187406310330638
187384636670170
187047338416520
187544270920...

result:

ok 100000 numbers

Test #11:

score: 0
Accepted
time: 2497ms
memory: 46168kb

input:

200000 200000
0011111000111101101011111111000010101011010000100000110110010110010000011010101011101001100001001001000001100110010100101101001111000111010011110100000100000001111111000001000101000011110001101101111000101001100010010011001101100111110000110001100001100011110011001100100010000010001101...

output:

187057082821034
187050489592834
185798962075874
186490497612254
185547643085476
185839649755426
186731725449660
186845143722558
186446910671932
186830913714546
186903848544526
186827856700414
187012840145598
187030896936824
186738571374322
186338959389628
186977751482606
187075649881228
186978915850...

result:

ok 100000 numbers

Test #12:

score: 0
Accepted
time: 0ms
memory: 13880kb

input:

1 3
0
2 1 1
1 1
2 1 1

output:

-1
0

result:

ok 2 number(s): "-1 0"

Test #13:

score: 0
Accepted
time: 4ms
memory: 13844kb

input:

7 2
0001100
1 2 1
2 3 10
3 4 100
4 5 1000
3 6 10000
6 7 100000
2 1 7
2 2 6

output:

2000
2000

result:

ok 2 number(s): "2000 2000"