Submission #1004056

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004056		irmuun	Seats (IOI18_seats)	C++17	25 / 100	4075 ms	123152 KiB

seats

#include<bits/stdc++.h>
//#include "seats.h"

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int n,h,w;
vector<int>r,c;

struct segtreeMin{
    int n;
    vector<int>d,u;
    void init(vector<int>v){
        n=v.size();
        u=v;
        d.resize(4*n);
        build(1,0,n-1);
    }
    void build(int node,int l,int r){
        if(l==r){
            d[node]=u[l];
            return;
        }
        int mid=(l+r)/2;
        build(node*2,l,mid);
        build(node*2+1,mid+1,r);
        d[node]=min(d[node*2],d[node*2+1]);
    }
    int query(int node,int l,int r,int L,int R){
        if(L>R||l>R||L>r) return n;
        if(L<=l&&r<=R){
            return d[node];
        }
        int mid=(l+r)/2;
        return min(query(node*2,l,mid,L,R),query(node*2+1,mid+1,r,L,R));
    }
    void update(int node,int l,int r,int pos,int val){
        if(pos<l||r<pos) return;
        if(l==r){
            d[node]=val;
            return;
        }
        int mid=(l+r)/2;
        update(node*2,l,mid,pos,val);
        update(node*2+1,mid+1,r,pos,val);
        d[node]=min(d[node*2],d[node*2+1]);
    }
};

struct segtreeMax{
    int n;
    vector<int>d,u;
    void init(vector<int>v){
        n=v.size();
        u=v;
        d.resize(4*n);
        build(1,0,n-1);
    }
    void build(int node,int l,int r){
        if(l==r){
            d[node]=u[l];
            return;
        }
        int mid=(l+r)/2;
        build(node*2,l,mid);
        build(node*2+1,mid+1,r);
        d[node]=max(d[node*2],d[node*2+1]);
    }
    int query(int node,int l,int r,int L,int R){
        if(L>R||l>R||L>r) return 0;
        if(L<=l&&r<=R){
            return d[node];
        }
        int mid=(l+r)/2;
        return max(query(node*2,l,mid,L,R),query(node*2+1,mid+1,r,L,R));
    }
    void update(int node,int l,int r,int pos,int val){
        if(pos<l||r<pos) return;
        if(l==r){
            d[node]=val;
            return;
        }
        int mid=(l+r)/2;
        update(node*2,l,mid,pos,val);
        update(node*2+1,mid+1,r,pos,val);
        d[node]=max(d[node*2],d[node*2+1]);
    }
};

segtreeMin sgr1,sgc1;
segtreeMax sgr2,sgc2;

void give_initial_chart(int H,int W,vector<int>R,vector<int>C){//len HW
    h=H,w=W,r=R,c=C,n=H*W;
    sgr1.init(r);
    sgr2.init(r);
    sgc1.init(c);
    sgc2.init(c);
}

int swap_seats(int a,int b){
    swap(r[a],r[b]);
    swap(c[a],c[b]);
    
    sgr1.update(1,0,n-1,a,r[a]);
    sgr2.update(1,0,n-1,a,r[a]);
    sgc1.update(1,0,n-1,a,c[a]);
    sgc2.update(1,0,n-1,a,c[a]);
    
    sgr1.update(1,0,n-1,b,r[b]);
    sgr2.update(1,0,n-1,b,r[b]);
    sgc1.update(1,0,n-1,b,c[b]);
    sgc2.update(1,0,n-1,b,c[b]);
    
    int ans=1;
    int r1=r[0],r2=r[0],c1=c[0],c2=c[0];
    for(int i=1;i<n;){
        r1=min(r1,r[i]);
        r2=max(r2,r[i]);
        c1=min(c1,c[i]);
        c2=max(c2,c[i]);
        int g=(r2-r1+1)*(c2-c1+1);
        if(g==i+1){
            ans++;
            i++;
        }
        else{
            r1=sgr1.query(1,0,n-1,0,g-1);
            r2=sgr2.query(1,0,n-1,0,g-1);
            c1=sgc1.query(1,0,n-1,0,g-1);
            c2=sgc2.query(1,0,n-1,0,g-1);
            i=g-1;
            continue;
        }
    }
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 20 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30