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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#187667 | #6404. Shuttle Tour | UESTC_Guest_WiFi | WA | 0ms | 16656kb | C++20 | 3.8kb | 2023-09-24 20:20:36 | 2023-09-24 20:20:36 |
Judging History
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 tot,mnd[55],bl[N+5];
void dfs1(int u,int tf){
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])
if(it.v!=son[u]&&it.v!=fa[u])
dfs2(it.v,it.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[u]<dep[v]) swap(u,v);
u=fa[top[u]];
}
return dep[u]<dep[v]?u:v;
}
namespace Segtr{
#define rc id<<1|1
#define lc id<<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){
// printf("%d %d\n",l,s[l]);
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){
// printf("%d %d ",res[0],vlca);
res[0]=LCA(res[0],vlca);
// printf("%d\n",res[0]);
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);
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; mnd[tot]=j;
used[j]=1;
}
mnd[tot]=fa[mnd[tot]];
}
build(1,n,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();
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);
ll ans=0; int rt=res[0];
// printf("%d %d %d\n",l,r,rt);
if(!rt) puts("-1");
else
for(int i=1;i<=tot;i++){
if(!res[i]) continue;
// printf("%d %d\n",res[i],rt);
if(dep[rt]>=dep[mnd[i]])
ans+=dw[res[i]]-dw[rt];
else
ans+=dw[res[i]]-dw[mnd[i]];
}
printf("%lld\n",ans<<1);
}
}
return 0;
}
Details
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Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 16656kb
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 0
result:
wrong answer Output contains longer sequence [length = 6], but answer contains 5 elements