Submission #650872

#TimeUsernameProblemLanguageResultExecution timeMemory
650872AntekbAbracadabra (CEOI22_abracadabra)C++14
0 / 100
522 ms72260 KiB
#include<bits/stdc++.h> //#pragma GCC optimize("Ofast") //#pragma GCC optimize("trapv") #define st first #define nd second #define pb push_back #define pp pop_back #define eb emplace_back #define mp(a, b) make_pair(a, b) #define all(x) (x).begin(), (x).end() #define rev(x) reverse(all(x)) #define sor(x) sort(all(x)) #define sz(x) (int)(x).size() #define rsz(x) resize(x) using namespace std; ///~~~~~~~~~~~~~~~~~~~~~~~~~~ template <typename H, typename T> ostream& operator<<(ostream& os, pair<H, T> m){ return os <<"("<< m.st<<", "<<m.nd<<")"; } template <typename H> ostream& operator<<(ostream& os, vector<H> V){ os<<"{"; for(int i=0; i<V.size(); i++){ if(i)os<<" "; os<<V[i]; } os<<"}"; return os; } void debug(){cerr<<"\n";} template <typename H, typename... T> void debug(H h, T... t) {cerr<<h; if (sizeof...(t)) cerr << ", "; debug(t...);} #define deb(x...) cerr<<#x<<" = ";debug(x); ///~~~~~~~~~~~~~~~~~~~~~~~~~ typedef long long ll; typedef long double ld; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef vector<int> vi; typedef vector<pii > vii; typedef vector<ll> vl; typedef vector<pll> vll; typedef string str; #define BOOST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL); mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); const int N=(1<<18), INF=1e9+5, mod=1e9+7; int val[N], ile[N+N], par[N], siz[N], gdzie[N]; vi co[N], sum[N]; void add(int i, int v){ for(i+=N; i; i>>=1){ ile[i]+=v; } } pair<int, int> find(int s){ int v=1; while(v<N){ if(ile[v+v]<s){ s-=ile[v+v]; v=v+v+1; } else v=v+v; } return mp(v-N, s); } /*void split(int i, int a){ assert(a!=siz[i]); //deb(i, siz[i], a); add(val[i], a-siz[i]); while(siz[i]>a){ int j=co[i].back(); co[i].pp(); siz[i]-=siz[j]; add(val[j], siz[j]); if(siz[i]<a){ split(j, a-siz[i]); siz[i]+=siz[j]; co[i].pb(j); add(val[j], -siz[j]); } } //add(val[i], siz[i]); }*/ int ans[int(1e6+5)]; set<int> S; int roz(int i){ return (*S.upper_bound(i))-i; } void split(int i, int s){ add(val[i], s-roz(i)); int t=i+s-1; //deb(i, s, t); while(co[t].back()!=t){ add(val[co[t].back()], roz(co[t].back())); S.insert(co[t].back()); co[t].pp(); } while(t!=i){ if(t==co[par[t]].back()){ break; } while(co[t].back()!=t){ add(val[co[t].back()], roz(co[t].back())); S.insert(co[t].back()); co[t].pp(); } t=par[t]; } } int main(){ BOOST; int n, q; cin>>n>>q; vi V; val[0]=n+5; V.pb(0); S.insert(n+1); for(int i=1; i<=n; i++){ cin>>val[i]; gdzie[val[i]]=i; while(val[V.back()]<val[i])V.pp(); par[i]=V.back(); V.pb(i); } for(int i=n; i>0; i--){ siz[i]++; siz[par[i]]+=siz[i]; co[i].pb(i); //sum[i].pb(1); } for(int i=1; i<=n; i++){ co[par[i]].pb(i); //sum[par[i]].pb(sum[par[i]].back()+siz[i]); if(par[i]==0){ add(val[i], siz[i]); S.insert(i); } } //deb(co[6]); vector<pair<pii, int> > Q(q); for(int qq=0; qq<q; qq++){ cin>>Q[qq].st.st>>Q[qq].st.nd; Q[qq].nd=qq; } sor(Q); int wsk=0; for(int t=0; ;t++){ assert(ile[1]==n); bool b=1; while(wsk<q && Q[wsk].st.st==t){ pii a=find(Q[wsk].st.nd); //deb(a, Q[wsk]); ans[Q[wsk].nd]=val[gdzie[a.st]+a.nd-1]; wsk++; } b=0; pii c=find(n/2); if(c.nd!=roz(gdzie[c.st]))split(gdzie[c.st], c.nd), b=1; //for(int i=1; i<=n; i++)cerr<<ile[N+i]<<" ";cerr<<"\n"; if(!b){ while(wsk<q){ pii a=find(Q[wsk].st.nd); deb(a, wsk); ans[Q[wsk].nd]=val[gdzie[a.st]+a.nd-1]; wsk++; } break; } } for(int i=0; i<q; i++)cout<<ans[i]<<"\n"; }
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