Submission #748020

#	Time	Username	Problem	Language	Result	Execution time	Memory
748020		ETheBest3	Robots (IOI13_robots)	C++14	39 / 100	3098 ms	18928 KiB

robots

#include "robots.h"
#include<bits/stdc++.h>
#define lli int
using namespace std;
const lli MAXN=1000005, INF=999999999;
lli tree[4*MAXN], X[MAXN], Y[MAXN], S[MAXN], W[MAXN], A, B, T;
bool used[MAXN];
struct rob{
    lli w, s, ind;
    const bool operator <(rob p) const{
        if(s!=p.s)return s>p.s;
        if(w!=p.w)return w<p.w;
        return ind<p.ind;
    }
};
rob a[MAXN];
void build_tree(lli ind, lli l, lli r){
    if(l==r){
        tree[ind]=a[l].w;
        return;
    }
    lli mid=(l+r)/2;
    build_tree(2*ind, l, mid);
    build_tree(2*ind+1, mid+1, r);
    tree[ind]=min(tree[2*ind], tree[2*ind+1]);
    return;
}
void update(lli ind, lli l, lli r, lli q, lli d){
    if(l>q or r<q)return;
    if(l==r){
        tree[ind]=d;
        used[l]=1;
        return;
    }
    lli mid=(l+r)/2;
    update(2*ind, l, mid, q, d);
    update(2*ind+1, mid+1, r, q, d);
    tree[ind]=min(tree[2*ind], tree[2*ind+1]);
    return;
}
int query(lli ind, lli l, lli r, lli q){
    if(l==r)return l;
    lli mid=(l+r)/2;
    if(tree[2*ind]<q)return query(2*ind, l, mid, q);
    return query(2*ind+1, mid+1, r, q);
}
bool check(lli br){
    build_tree(1, 0, T-1);
    for(lli i=0; i<T; i++)used[i]=0;
    for(lli i=0; i<A; i++){
        lli t=0;
        while(t<br){
            lli ind=query(1, 0, T-1, X[i]);
            if(a[ind].w>=X[i])break;
            update(1, 0, T-1, ind, INF);
            t++;
        }
    }
    lli p1=T-1;
    for(lli i=0; i<B; i++){
        lli t=0;
        while(t<br){
            while(used[p1]==1 and p1>=0)p1--;
            if(p1<0 or a[p1].s>=Y[i])break;
            p1--;
            t++;
        }
    }
    while(used[p1]==1 and p1>=0)p1--;
    if(p1>=0)return 0;
    return 1;
}
int bin_search(lli l, lli r){
    while(l<r-1){
        lli mid=(l+r)/2;
        if(check(mid))r=mid;
        else l=mid;
    }
    if(check(l))return l;
    if(check(r))return r;
    return -1;
}
int putaway(int A1, int B1, int T1, int X1[], int Y1[], int W1[], int S1[]) {
    A=A1;
    B=B1;
    T=T1;
    for(lli i=0; i<T; i++){
        W[i]=W1[i];
        S[i]=S1[i];
        a[i]={W[i], S[i], i};
    }
    for(lli i=0; i<A; i++)X[i]=X1[i];
    for(lli i=0; i<B; i++)Y[i]=Y1[i];
    sort(a, a+T);
    sort(X, X+A);
    sort(Y, Y+B);
    return bin_search(T/(A+B), T);
}

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