Submission #970929

#TimeUsernameProblemLanguageResultExecution timeMemory
970929happy_nodeTwo Currencies (JOI23_currencies)C++17
100 / 100
4543 ms57416 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; const int MX=1e5+5, MK=18; int N,M,Q; vector<int> qry[MX]; ll S[MX], T[MX], X[MX], Y[MX], ans[MX], lca[MX]; int L[MX], R[MX], U[MX], V[MX]; int up[MX][MK], tin[MX], tout[MX], timer=0; struct segtree { ll t[4*MX], lazy[4*MX]; void push(int v, int l, int r) { t[v]+=lazy[v]; if(l!=r) { lazy[2*v+0]+=lazy[v]; lazy[2*v+1]+=lazy[v]; } lazy[v]=0; } void update(int v, int l, int r, int ql, int qr, int val) { push(v,l,r); if(qr<l || r<ql) return; if(ql<=l && qr>=r) { lazy[v]+=val; push(v,l,r); return; } int mid = (l + r) >> 1; update(v*2+0, l, mid+0, ql, qr, val); update(v*2+1, mid+1, r, ql, qr, val); t[v] = t[v*2+0] + t[v*2+1]; } ll query(int v, int l, int r, int ql, int qr) { push(v,l,r); if(ql > r || qr < l) return 0; if(ql <= l && qr >= r) return t[v]; int mid = (l + r) >> 1; return query(v*2+0, l, mid+0, ql, qr) + query(v*2+1, mid+1, r, ql, qr); } void upd(int pos, ll val) { update(1,1,N,tin[pos],tout[pos],val); } ll que(int a, int b) { return query(1,1,N,tin[a],tin[a])-query(1,1,N,tin[b],tin[b]); } void reset() { for(int i=0;i<4*MX;i++) t[i]=0,lazy[i]=0; } } st, tt; vector<int> adj[MX]; void dfs(int v, int p) { tin[v]=++timer; up[v][0]=p; for(int k = 1; k < MK; k++) { up[v][k]=up[up[v][k-1]][k-1]; } for(auto u : adj[v]) { if(u == p) continue; dfs(u,v); } tout[v]=timer; } bool isAnc(int v, int anc) { if(tin[anc]<=tin[v] && tout[v]<=tout[anc]) return 1; return 0; } int LCA(int u, int v) { if(isAnc(u, v)) return v; if(isAnc(v, u)) return u; for(int k=MK-1; k>=0;k--) { if(!isAnc(u, up[v][k]) && up[v][k]!=0) v = up[v][k]; } return up[v][0]; } int main() { cin.tie(0); ios_base::sync_with_stdio(0); cin>>N>>M>>Q; for(int i=1;i<=N-1;i++) { int u,v; cin>>u>>v; adj[u].push_back(v); adj[v].push_back(u); U[i]=u; V[i]=v; } vector<pair<int,int>> e; e.push_back({0,0}); for(int i=0;i<M;i++) { int p,c; cin>>p>>c; e.push_back({c,p}); } dfs(1,0); sort(e.begin(),e.end()); for(int i=0;i<Q;i++) { cin>>S[i]>>T[i]>>X[i]>>Y[i]; L[i]=0,R[i]=M; int m=(L[i]+R[i])/2; lca[i]=LCA(S[i],T[i]); qry[m].push_back(i); } for(int i=1;i<=N-1;i++) { if(isAnc(V[i],U[i])) swap(U[i],V[i]); // V parentnya } for(int ii=0;ii<20;ii++) { st.reset(); tt.reset(); // activate for(int i=1;i<=M;i++) { auto [c,p]=e[i]; st.upd(U[p],1); } vector<pair<int,int>> nxt; for(int i=0;i<=M;i++) { auto [c,p]=e[i]; if(i>0) { st.upd(U[p],-1); tt.upd(U[p],c); } for(auto id:qry[i]) { ll s=tt.que(S[id],lca[id])+tt.que(T[id],lca[id]); if(s<=Y[id]) { ans[id]=st.que(S[id],lca[id])+st.que(T[id],lca[id]); L[id]=i+1; if(L[id]<=R[id]) nxt.push_back({(L[id]+R[id])/2, id}); } else { R[id]=i-1; if(L[id]<=R[id]) nxt.push_back({(L[id]+R[id])/2, id}); } } } for(int i=0;i<=M;i++) qry[i].clear(); for(auto [i,id]:nxt) qry[i].push_back(id); } for(int i=0;i<Q;i++) { if(ans[i]>X[i]) { cout<<-1<<'\n'; } else { cout<<X[i]-ans[i]<<'\n'; } } }
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