Submission #834762

#	Time	Username	Problem	Language	Result	Execution time	Memory
834762		JakobZorz	Distributing Candies (IOI21_candies)	C++17	3 / 100	69 ms	11520 KiB

candies

#include"candies.h"
#include<iostream>
#include<vector>
using namespace std;
typedef long long ll;

int n,days;
const int TREE_SIZE=1<<11;

vector<ll>mn;
vector<ll>mx;
void tree_init(){
    mn.resize(TREE_SIZE*2);
    mx.resize(TREE_SIZE*2);
}

void update_node(int node){
    if(node>=TREE_SIZE){
        mn[node]=mx[node];
        return;
    }
    
    mn[node]=min(mn[2*node],mn[2*node+1]);
    mx[node]=max(mx[2*node],mx[2*node+1]);
}

void tree_add(int node,int l,int r,int pos,int val){
    //cout<<l<<" "<<r<<endl;
    if(r<=pos)
        return;
    
    if(node>=TREE_SIZE){
        mx[node]+=val;
        update_node(node);
        return;
    }
    
    int m=(l+r)/2;
    tree_add(2*node,l,m,pos,val);
    tree_add(2*node+1,m,r,pos,val);
    update_node(node);
}

void tree_add(int pos,int val){
    tree_add(1,0,TREE_SIZE,pos,val);
}

int tree_get(int bound){
    /*for(int i=0;i<days;i++)
        cout<<mn[TREE_SIZE+i]<<" ";
    cout<<endl;*/
    
    int min_i=days-1,max_i=days-1;
    for(int i=days-1;i>=0;i--){
        if(mn[TREE_SIZE+i]<mn[TREE_SIZE+min_i])
            min_i=i;
        if(mn[TREE_SIZE+i]>mn[TREE_SIZE+max_i])
            max_i=i;
        if(mn[TREE_SIZE+max_i]-mn[TREE_SIZE+min_i]>=bound){
            if(max_i==i){
                return mn[TREE_SIZE+days-1]-mn[TREE_SIZE+min_i];
            }else{
                return bound-(mn[TREE_SIZE+max_i]-mn[TREE_SIZE+days-1]);
            }
        }
    }
    
    return mn[TREE_SIZE+days-1]-mn[TREE_SIZE+min_i];
}

vector<int>distribute_candies(vector<int>c,vector<int>l,vector<int>r,vector<int>v){
    n=(int)c.size();
    days=(int)v.size()+1;
    vector<vector<pair<int,int>>>events;
    events.resize(n+1);
    
    if(n>2000||days>2001)
        return{};
    
    for(int i=0;i<days-1;i++){
        events[l[i]].push_back({i+1,v[i]});
        events[r[i]+1].push_back({i+1,-v[i]});
    }
    
    vector<int>s(n);
    tree_init();
    
    for(int i=0;i<n;i++){
        for(auto event:events[i])
            tree_add(event.first,event.second);
        s[i]=tree_get(c[i]);
    }
    
    return s;
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 8
• Subtask 3: 0 / 27
• Subtask 4: 0 / 29
• Subtask 5: 0 / 33