前言

跟爍爍的游戲一模一樣

代碼

#include<bits/stdc++.h> #define LL long long using namespace std; const int _ = 1e5+1e2; const int INF = 2e9; namespace zjy_io{inline char gc(){static char buf[1<<6],*p1=buf,*p2=buf;return (p1==p2)&&(p2=(p1=buf)+fread(buf,1,1<<6,stdin),p1==p2)?EOF:*p1++;}template <class T>inline void read(T&data){data=0;register char ch=0;register int caa=1;while((ch<'0'||ch>'9')&&ch!='-')ch=gc();ch=='-'?caa=-1,ch=gc():caa=1;while(ch<='9'&&ch>='0'){data=(data<<3)+(data<<1)+(ch&15);ch=gc();}data*=caa;}inline char Getchar(){register char ch=0;while(ch<'A'||ch>'Z')ch=gc();return ch;} } int vlaue[_]; using namespace zjy_io; int mem[3000000],*pin=mem; int n,m; struct Tree_array{int size,*tree;int lowbit(register int k){return k&(-k);}void init(register int kr){tree=pin,size=kr,pin+=size+3;}void modify(register int loc,register int zh){loc=min(loc,size),++loc;for(register int i=loc;i<=size+1;i+=lowbit(i))tree[i]+=zh;}int query(register int l){l>size?l=size:l=l;register int ret=0;++l;for(register int i=l;i;i-=lowbit(i))ret+=tree[i];return ret;} }; namespace d_tree{int root,head[_],cnt,par[_]; void add(register int a,register int b){par[b]=a;}Tree_array node1[_],node2[_]; } struct orginal_tree{struct edge{int nt,to;}e[_<<1];int head[_],cnt,root,size[_],all,MX;int dfn[_],fdfn[_],vis[_],dis[_],app[_],st[_<<1][18],tot,lg[_<<1];int get_lca(register int u,register int v){u=app[u],v=app[v];if(u>v)swap(u,v);register int LEN= lg[v-u+1];return fdfn[min(st[u][LEN],st[v+1-(1<<LEN)][LEN])];}int getdist(register int u,register int v){return dis[u]+dis[v]-2*dis[get_lca(u,v)];}void add(register int a,register int b){e[++cnt].to=b,e[cnt].nt=head[a],head[a]=cnt;}void dfs(register int now,register int fa){dfn[now]=++cnt,fdfn[cnt]=now,st[++tot][0]=cnt,app[now]=tot;for(register int i=head[now];i;i=e[i].nt){if(e[i].to==fa)continue;dis[e[i].to]=dis[now]+1;dfs(e[i].to,now);st[++tot][0]=dfn[now];}}int dfsI(register int now,register int fa){int len_=0;for(register int i=head[now];i;i=e[i].nt){if(e[i].to==fa||vis[e[i].to])continue;len_=max(len_,dfsI(e[i].to,now));}return len_+1;}void getroot(register int now,register int fa){size[now]=1;register int mx=0;for(register int i=head[now];i;i=e[i].nt){if(vis[e[i].to]||e[i].to==fa)continue;getroot(e[i].to,now);size[now]+=size[e[i].to];mx=max(size[e[i].to],mx);}mx=max(mx,all-size[now]);if(MX>mx)MX=mx,root=now;}void p_divide(register int now){vis[now]=1;for(register int i=head[now];i;i=e[i].nt){if(vis[e[i].to])continue;MX=INF;all=size[e[i].to];getroot(e[i].to,now);d_tree::add(now,root);d_tree::node1[root].init(dfsI(root,0)-1);p_divide(root);}}void init(){for(register int i=1,a,b;i<n;++i)read(a),read(b),add(a,b),add(b,a);cnt=0;dfs(1,0);register int us=2*n-1;for(register int j=1;j<=17;++j)for(register int i=1;i<=us&&i+(1<<(j-1))<=us;++i)st[i][j]=min(st[i][j-1],st[i+(1<<(j-1))][j-1]);for(register int i=2;i<=us;++i)lg[i]=lg[i>>1]+1;MX=INF,all=n;getroot(1,0);d_tree::node1[root].init(dfsI(root,0)-1);d_tree::root=root;p_divide(root);} }tr; namespace d_tree{ void modify(register int a,register int b){register int dist;node1[a].modify(0,b);for(register int i=a;par[i];i=par[i]){dist = tr.getdist(a,par[i]);node1[par[i]].modify(dist,b);node2[i].modify(dist,b);}}int query(register int a,register int b){register int ret=0,dist;ret+=node1[a].query(b);for(register int i=a;par[i];i=par[i]){dist = tr.getdist(a,par[i]);if(b-dist<0)continue;ret+=node1[par[i]].query(b-dist);ret-=node2[i].query(b-dist);}return ret;}void init(){for(register int i=1;i<=n;++i) node2[i].init( node1[par[i]].size );for(register int i=1;i<=n;++i)modify(i,vlaue[i]);} } int main(){//freopen("data.in","r",stdin);//freopen("1.out","w",stdout);read(n),read(m);for(register int i=1;i<=n;++i)read(vlaue[i]);tr.init();d_tree::init();register int a,b,lastans=0;while(m--){read(a);if(a==1){read(a),read(b);a^=lastans;b^=lastans;d_tree::modify(a,b-vlaue[a]);vlaue[a]=b;}else {read(a);read(b);a^=lastans,b^=lastans;printf("%d\n",lastans=d_tree::query(a,b));}} }

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