제출 #997657

#제출 시각아이디문제언어결과실행 시간메모리
997657bachhoangxuanComparing Plants (IOI20_plants)C++17
44 / 100
212 ms22532 KiB
#include "plants.h"
#include<bits/stdc++.h>
using namespace std;
const int maxn = 2e5+5;
const int inf = 1e9;
int n,k;
vector<int> P,R;
set<int> ss,cc;

void cal(int x,int y){
    cc.erase(y);
    if((y-x+n)%n>=k){
        //cout << "add " << y << '\n';
        cc.insert(y);
    }
}

void add(int x){
    if(ss.empty()){
        ss.insert(x);
        cc.insert(x);
        //cout << "add " << x << '\n';
        return;
    }
    auto it=ss.lower_bound(x);
    if(it!=ss.end()) cal(x,*it);
    else cal(x,*ss.begin());
    if(it==ss.begin()) cal(*ss.rbegin(),x);
    else{
        it--;
        cal(*it,x);
    }
    ss.insert(x);
}
void del(int x){
    cc.erase(x);ss.erase(x);
    if(ss.empty()) return;
    auto it=ss.lower_bound(x);
    int y=(it!=ss.end()?*it:*ss.begin());
    cc.insert(y);
}

int tree[4*maxn],lazy[4*maxn];
void build(int l,int r,int id){
    if(l==r){
        tree[id]=R[l];
        return;
    }
    int mid=(l+r)>>1;
    build(l,mid,id<<1);build(mid+1,r,id<<1|1);
    tree[id]=min(tree[id<<1],tree[id<<1|1]);
}
void getnew(int id,int val){
    tree[id]-=val;
    lazy[id]+=val;
}
void pushdown(int id){
    if(!lazy[id]) return;
    getnew(id<<1,lazy[id]);
    getnew(id<<1|1,lazy[id]);
    lazy[id]=0;
}
void get(int l,int r,int id){
    if(tree[id]>0) return;
    if(l==r){
        tree[id]=inf;
        //cout << "add2 " << l << '\n';
        add(l);
        return;
    }
    pushdown(id);
    int mid=(l+r)>>1;
    get(l,mid,id<<1);get(mid+1,r,id<<1|1);
    tree[id]=min(tree[id<<1],tree[id<<1|1]);
}
void update(int l,int r,int id,int tl,int tr){
    if(tr<l || r<tl) return;
    if(tl<=l && r<=tr){
        getnew(id,1);
        return;
    }
    pushdown(id);
    int mid=(l+r)>>1;
    update(l,mid,id<<1,tl,tr);update(mid+1,r,id<<1|1,tl,tr);
    tree[id]=min(tree[id<<1],tree[id<<1|1]);
}

void init(int _k, std::vector<int> r) {
    k=_k;R=r;
    n=(int)r.size();
    P.assign(n,0);
    build(0,n-1,1);
    for(int i=n-1;i>=0;i--){
        get(0,n-1,1);
        int x=*cc.begin();P[x]=i;del(x);
        //cout << "P " << x << ' ' << i << '\n';
        if(x>=k-1) update(0,n-1,1,x-k+1,x);
        else{
            update(0,n-1,1,0,x);
            update(0,n-1,1,n-(k-x)+1,n-1);
        }
    }
    //for(int i=0;i<n;i++) cout << P[i] << ' ';
    //cout << '\n';
}

int compare_plants(int x, int y) {
	return (P[x]>P[y]?1:-1);
}
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