Submission #118083

#TimeUsernameProblemLanguageResultExecution timeMemory
118083kig9981Cats or Dogs (JOI18_catdog)C++17
0 / 100
5 ms3712 KiB
#include <bits/stdc++.h> #include "catdog.h" using namespace std; const int SZ=1<<17; vector<int> adj[100000]; int node_cnt, depth[100000], parent[100000], W[100000], num[100000], num_rev[100000], hld[100000], V[100000], ans; pair<int,int> tree[2*SZ], itree[2*SZ]; void set_tree(int n, int v) { for(itree[n+=SZ].first=v;n>>=1;) itree[n]=max(itree[2*n],itree[2*n+1]); } pair<int,int> get_max(int s, int e) { pair<int,int> ret; for(s+=SZ,e+=SZ;s<=e;s>>=1,e>>=1) { if(s&1) ret=max(ret,itree[s++]); if(~e&1) ret=max(ret,itree[e--]); } return ret; } void add_tree(int s, int e, int v1, int v2) { for(s+=SZ,e+=SZ;s<=e;s>>=1,e>>=1) { if(s&1) { tree[s].first+=v1; tree[s++].second+=v2; } if(~e&1) { tree[e].first+=v1; tree[e--].second+=v2; } } } pair<int,int> get_value(int n) { pair<int,int> ret; for(ret=tree[n+=SZ];n>>=1;) { ret.first+=tree[n].first; ret.second+=tree[n].second; } return ret; } int dfs(int c) { W[c]=1; for(auto n: adj[c]) if(W[n]==0) { parent[n]=c; depth[n]=depth[c]+1; W[c]+=dfs(n); } return W[c]; } void dfs2(int c) { num[c]=node_cnt++; num_rev[num[c]]=c; for(auto n: adj[c]) if(parent[n]==c && 2*W[n]>=W[c]) { hld[n]=hld[c]; dfs2(n); } for(auto n: adj[c]) if(parent[n]==c && 2*W[n]<W[c]) { hld[n]=n; dfs2(n); } } void initialize(int N, vector<int> A, vector<int> B) { itree[SZ+N-1].second=N-1; parent[0]=-1; for(int i=0;i<N-1;i++) { adj[--A[i]].push_back(--B[i]); adj[B[i]].push_back(A[i]); itree[SZ+i].second=i; } dfs(0); dfs2(0); for(int i=SZ-1;i;i--) itree[i]=max(itree[2*i],itree[2*i+1]); } int query(int a) { while(a>=0) { auto temp=get_max(num[hld[a]],num[a]); if(temp.first) return temp.second; a=parent[hld[a]]; } return 0; } void update(int a, int b, int v1, int v2) { if(b==-1) return; while(hld[a]!=hld[b]) { add_tree(num[hld[b]],num[b],v1,v2); b=parent[hld[b]]; } add_tree(num[a],num[b],v1,v2); } int cat(int c) { int idx=num[--c], pidx=query(c); auto[v1,v2]=get_value(idx); auto[pv1,pv2]=get_value(pidx); if(pidx || V[pidx]) { if(V[pidx]==1) ans-=pv2; else if(V[pidx]==2) ans-=pv1-1; } else ans+=min(pv1+1-v1,pv2-v2)-min(pv1,pv2); V[idx]=1; set_tree(idx,1); ans+=v2; update(num_rev[pidx],parent[num_rev[idx]],1-v1,-v2); return ans; } int dog(int c) { int idx=num[--c], pidx=query(c); auto[v1,v2]=get_value(idx); auto[pv1,pv2]=get_value(pidx); if(pidx || V[pidx]) { if(V[pidx]==1) ans-=pv2-1; else if(V[pidx]==2) ans-=pv1; } else ans+=min(pv1-v1,pv2+1-v2)-min(pv1,pv2); V[idx]=2; set_tree(idx,1); ans+=v1; update(num_rev[pidx],parent[num_rev[idx]],-v1,1-v2); return ans; } int neighbor(int c) { int idx=num[--c], pidx=query(parent[c]); auto[v1,v2]=get_value(idx); auto[pv1,pv2]=get_value(pidx); if(pidx || V[pidx]) { if(V[pidx]==1) ans-=pv2-v2; else if(V[pidx]==2) ans-=pv1-v1; } else ans+=min(pv1+v1-(V[idx]==1),pv2+v2-(V[idx]==2))-min(pv1,pv2); if(V[idx]==1) ans-=v2; else if(V[idx]==2) ans-=v1; update(num_rev[pidx],parent[num_rev[idx]],v1-(V[idx]==1),v2-(V[idx]==2)); V[idx]=0; set_tree(idx,0); return ans; }
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