제출 #69905

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
69905		Diuven	커다란 상품 (IOI17_prize)	C++14	0 / 100	125 ms	1972 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
typedef vector<int> vi;
const int MX=200010;

bool up[MX];
int L[MX], R[MX], sum, n, ans=-1;

void my_ask(int i){
	if(L[i]>=0) return;
	vi now=ask(i);
	L[i]=now[0], R[i]=now[1];
}

void search(int s, int e, int lc, int mc, int rc){
	if(s>e || mc<=0) return;

	int m=(s+e)/2;

	for(int i=m; i<=e; i++){
		my_ask(i);
		if(L[i]+R[i]==0){ ans=i; return; }
		if(L[i]+R[i]==sum){
			search(s,m-1, lc, L[i]-(i-m)-lc, R[i]+i-m);
			search(i+1,e, L[i], R[i]-rc, rc);
			return;
		}
	}
	for(int i=m; i>=s; i--){
		my_ask(i);
		if(L[i]+R[i]==0){ ans=i; return; }
		if(L[i]+R[i]==sum){
			search(s,i-1, lc, L[i]-lc, R[i]);
			return;
		}
	}
}

void solve(){
	int b=0;
	for(; b*b<=n; b++);
	for(int i=0; i*b<n; i++){
		my_ask(i*b);
		sum=max(sum, L[i*b]+R[i*b]);
	}
	for(int i=0; i*b<n; i++){
		for(int j=i; j<n; j++){
			my_ask(j);
			if(L[j]+R[j]==sum){
				int e=min(n-1, i*b+b-1); my_ask((e==n-1 ? e : e+1));
				int l=L[j], r=R[(e==n-1 ? e : e+1)] + (e!=n-1 && L[e+1]+R[e+1]!=sum);
				search(j, e, l, sum-l-r, r);
			}
		}
	}
}

int find_best(int _n){
	n=_n;
	for(int i=0; i<n; i++) L[i]=R[i]=-1;
	solve();
	assert(ans>=0 && L[ans]==0 && R[ans]==0);
	return ans;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 80