Submission #965684

#	Time	Username	Problem	Language	Result	Execution time	Memory
965684		Amr	Robots (IOI13_robots)	C++17	90 / 100	3023 ms	30488 KiB

robots

#include "robots.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define sz size()
#define all(x) (x).begin(),(x).end()
const int N  = 1e6+2;
vector<pair<ll,ll> > v;
ll n1, n2 , n;
ll xx[N],yy[N];
bool cmp(pair<ll,ll> a, pair<ll,ll> b)
{
    return a.S > b.S;
}
bool cmp2(pair<ll,ll> a, pair<ll,ll> b)
{
    return a.S < b.S;
}

bool good(ll x)
{

    if(n2>0)sort(all(v));
    ll lst = 0;
    for(int i = 0; i < n1; i++)
    {
        pair<ll,ll> p = {xx[i],0};
       ll pos = (lower_bound(v.begin(),v.end(),p)-v.begin());
        pos--;
        if(pos<lst) continue;
        //reverse(v.begin()+lst,v.begin()+pos+1);
        if(n2>0) sort(v.begin()+lst,v.begin()+pos+1,cmp);
        lst = max(lst,min(pos+1,lst+x));
        //if(lst!=pos+1) sort(v.begin()+lst,v.begin()+pos+1);

     //   cout << pos << " ";
    }

    if(lst!=n&&n2>0)
    sort(v.begin()+lst,v.begin()+n,cmp2);
    for(int i = 0; i < n2; i++)
    {
        ll cnt = 0;
        while(cnt<x&&lst<n&&v[lst].S<yy[i]) cnt++,lst++;

    }
    return (lst==n);
}
int putaway(int A, int B, int T, int X[], int Y[], int W[], int S[]) {
    n = T , n1 = A , n2 = B;
    v.resize(n);
    for(int i = 0; i < A; i++) xx[i] = X[i];
    for(int i = 0; i < B; i++) yy[i] = Y[i];
    for(int i = 0; i < n; i++) v[i] = {W[i],S[i]};
    sort(all(v));
    sort(xx,xx+n1);
    sort(yy,yy+n2);
    if(good(n)==0) return -1;
    ll l = 0, r = n;
    //while(!good(r)) r*=2;

    while(l+1<r)
    {
        ll mid = (l+r)/2;
        if(good(mid)) r = mid;
        else l = mid;
    }
    return r;
}

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