Submission #290341

#	Time	Username	Problem	Language	Result	Execution time	Memory
290341		eohomegrownapps	Robots (IOI13_robots)	C++14	28 / 100	377 ms	12900 KiB

robots

#include "robots.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
ll w,h;

vector<pair<ll,ll>> coords;

struct Fenwick{
    vector<ll> fenwick;
    int n;
    Fenwick(int _n){
        n=_n;
        fenwick.resize(n+1);
    }

    void update(int ind, int val){
        ind++;
        while (ind<=n){
            fenwick[ind]+=val;
            ind+=ind&(-ind);
        }
    }

    ll query(int ind){
        ind++;
        ll ans=0;
        while (ind>0){
            ans+=fenwick[ind];
            ind-=ind&(-ind);
        }
        return ans;
    }
};

bool success(ll mid){
    Fenwick f(h+1);
    for (auto c : coords){
        int x = c.first;
        int y = c.second;
        f.update(h-y,1);

        ll numobjs = f.query(h-y);
        ll val = mid*(w-1-x+h-1-y);
        //cout<<x<<' '<<y<<' '<<numobjs<<' '<<val<<endl;
        if (val-numobjs<0){return false;}
    }
    return true;
}
 
int putaway(int lx, int ly, int n, int xpos[], int ypos[], int xtoys[], int ytoys[]) {
    sort(xpos,xpos+lx);
    sort(ypos,ypos+ly);
    for (ll i = 0; i<n; i++){
        xtoys[i]=upper_bound(xpos,xpos+lx,xtoys[i])-xpos;
        ytoys[i]=upper_bound(ypos,ypos+ly,ytoys[i])-ypos;
    }
    w=lx+1;
    h=ly+1;
    for (ll i = 0; i<n; i++){
        coords.push_back({xtoys[i],ytoys[i]});
        if (xtoys[i]==w-1&&ytoys[i]==h-1){
            return -1;
        }
    }
    sort(coords.rbegin(), coords.rend());
    ll l = 0, r = n;
    while (l<=r){
        ll mid = (l+r)/2;;
        if (success(mid)){
            r=mid-1;
        } else {
            l=mid+1;
        }
    }
    return l;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 0 / 25
• Subtask 4: 0 / 37
• Subtask 5: 0 / 10