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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#187784#6404. Shuttle TourUESTC_Guest_WiFiAC ✓781ms149868kbC++204.2kb2023-09-24 22:26:202023-09-24 22:26:20

Judging History

你现在查看的是最新测评结果

  • [2023-09-24 22:26:20]
  • 评测
  • 测评结果:AC
  • 用时:781ms
  • 内存:149868kb
  • [2023-09-24 22:26:20]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
const int N=2e5;
int n,q;
char s[N+5];
struct E{
    int v,w;
    E(int v=0,int w=0):v(v),w(w){}
};
vector<E> e[N+5];
int fa[N+5],dep[N+5];
ll dw[N+5];
int sz[N+5],son[N+5],top[N+5];
int dfn[N+5],dfns;
int tot,bl[N+5];
void dfs1(int u,int tf){
    dfn[u]=++dfns;
    fa[u]=tf; sz[u]=1;
    dep[u]=dep[tf]+1;
    for(auto it:e[u]){
        int v=it.v;
        if(v==tf) continue;
        dw[v]=dw[u]+it.w;
        dfs1(v,u);
        if(sz[v]>sz[son[u]]) son[u]=v;
        sz[u]+=sz[v];
    }
}
void dfs2(int u,int tf){
    top[u]=tf;
    if(!son[u]) return;
    dfs2(son[u],tf);
    for(auto it:e[u]){
        int v=it.v;
        if(v!=son[u]&&v!=fa[u])
            dfs2(v,v);
    }
}
int LCA(int u,int v){
    if(!u||!v) return u+v;
    // printf("%d %d\n",u,v);
    while(top[u]!=top[v]){
        if(dep[top[u]]<dep[top[v]]) swap(u,v);
        u=fa[top[u]];
    }
    return dep[u]<dep[v]?u:v;
}
namespace Segtr{
    #define lc id<<1
    #define rc id<<1|1
    int mx[N*4+5][55],lca[N*4+5];
    int cmp(int x,int y){ return !x||!y?x+y:dep[x]<dep[y]?y:x; }
    void push_up(int id){
        // printf("%d %d ",lca[lc],lca[rc]);
        lca[id]=LCA(lca[lc],lca[rc]);
        // printf("%d\n",lca[id]);
        for(int i=1;i<=tot;i++)
            mx[id][i]=cmp(mx[lc][i],mx[rc][i]);
    }
    void build(int l,int r,int id){
        if(l==r){
            if(s[l]) lca[id]=mx[id][bl[l]]=l;
            return;
        }
        int mid=l+r>>1;
        build(l,mid,lc); build(mid+1,r,rc);
        push_up(id);
    }
    void upd(int l,int r,int p,int id){
        if(l==r){
            s[l]^=1;
            if(s[l]) lca[id]=mx[id][bl[l]]=l;
            else lca[id]=mx[id][bl[l]]=0;
            return;
        }
        int mid=l+r>>1;
        if(p<=mid) upd(l,mid,p,lc);
        else upd(mid+1,r,p,rc);
        push_up(id);
    }
    int res[55];
    void update(int val[],int vlca){
        res[0]=LCA(res[0],vlca);
        for(int i=1;i<=tot;i++)
            res[i]=cmp(res[i],val[i]);
    }
    void query(int l,int r,int st,int en,int id){
        if(st<=l&&en>=r){
            // printf("%d %d\n",l,r);
            update(mx[id],lca[id]); return;
        }
        int mid=l+r>>1;
        if(st<=mid) query(l,mid,st,en,lc);
        if(en>mid) query(mid+1,r,st,en,rc);
    }
}
using namespace Segtr;
bool used[N+5];
void prep(){
    dfs1(1,0); dfs2(1,1);
    bl[1]=1;
    for(int i=2;i<=n;i++)
        if(e[i].size()==1){
            tot++;
            for(int j=i;j&&!used[j];j=fa[j]){
                bl[j]=tot; used[j]=1;
            }
        }
    build(1,n,1);
}
bool cmpv(int x,int y){ return dfn[x]<dfn[y]; }
ll calc(vector<int> ver){
    if(!ver.size()) return -1;
    sort(ver.begin(),ver.end(),cmpv);
    // fprintf(stderr,"ok\n");
    static int st[55];
    int s=0; ll ans=0;
    st[++s]=ver[0];
    // fprintf(stderr,"ok");
    for(int i=1;i<ver.size();i++){
        int u=ver[i],lca=LCA(u,st[s]);
        while(s>1&&dep[st[s-1]]>dep[lca]){
            ans+=dw[st[s]]-dw[st[s-1]];
            s--;
        }
        if(dep[st[s]]>dep[lca]){
            ans+=dw[st[s]]-dw[lca];
            s--;
        }
        if(st[s]!=lca) st[++s]=lca;
        st[++s]=u;
    }
    // puts("");
    while(s>1){
        ans+=dw[st[s]]-dw[st[s-1]];
        s--;
    }
    return ans<<1;
}
int main(){
    scanf("%d %d",&n,&q);
    scanf("%s",s+1);
    for(int i=1;i<=n;i++) s[i]-='0';
    for(int i=1,u,v,w;i<n;i++){
        scanf("%d %d %d",&u,&v,&w);
        e[u].push_back(E(v,w));
        e[v].push_back(E(u,w));
    }
    prep();
    // fprintf(stderr,"%d\n",tot);
    while(q--){
        int tp,l,r;
        scanf("%d %d",&tp,&l);
        if(tp==1) upd(1,n,l,1);
        else{
            scanf("%d",&r);
            memset(res,0,sizeof res);
            query(1,n,l,r,1);
            vector<int> ver;
            for(int i=0;i<=tot;i++)
                if(res[i]){
                    // fprintf(stderr,"%d ",res[i]);
                    ver.push_back(res[i]);
                }
            // fprintf(stderr,"\n");
            printf("%lld\n",calc(ver));
        }
    }
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 14356kb

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: 125ms
memory: 12356kb

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: 120ms
memory: 13804kb

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: 119ms
memory: 15396kb

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: 3ms
memory: 13652kb

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: 84ms
memory: 149868kb

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: 94ms
memory: 149712kb

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: 95ms
memory: 143444kb

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: 756ms
memory: 141528kb

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: 757ms
memory: 139388kb

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: 781ms
memory: 139472kb

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: 13772kb

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: 2ms
memory: 12032kb

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"