Submission #835217

#	Time	Username	Problem	Language	Result	Execution time	Memory
835217		oscar1f	The Big Prize (IOI17_prize)	C++17	90 / 100	84 ms	11396 KiB

prize

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

using namespace std;

const int MAX_VAL=200*1000+5;
int nbVal,nbPasMax,rep,nbTest;
vector<pair<int,int>> interCour,interNouv;
vector<int> memo[MAX_VAL];

void calc(int deb,int fin,int nbGau,int nbDro) {
	if (fin<deb or nbGau+nbDro==nbPasMax) {
		return;
	}
	int mid=(deb+fin)/2;
	vector<int> ans;
	if (memo[mid][0]==-1) {
		ans=ask(mid);
		memo[mid]=ans;
	}
	else {
		ans=memo[mid];
	}
	if (ans[0]+ans[1]<nbPasMax) {
		if (ans[0]+ans[1]==0) {
			rep=mid;
		}
		calc(deb,mid-1,nbGau,ans[1]+1);
		calc(mid+1,fin,ans[0]+1,nbDro);
	}
	else {
		calc(deb,mid-1,nbGau,ans[1]);
		calc(mid+1,fin,ans[0],nbDro);
	}
}

int find_best(int n) {
	nbVal=n;
	for (int i=0;i<nbVal;i++) {
		memo[i]={-1,-1};
	}
	nbTest=500;
	int deb,fin,mid;
	vector<int> ans;
	interCour.push_back({0,nbVal-1});
	while (!interCour.empty() and nbTest>0) {
		interNouv.clear();
		for (auto i:interCour) {
			deb=i.first;
			fin=i.second;
			mid=(deb+fin)/2;
			if (nbTest>0) {
				nbTest--;
				ans=ask(mid);
				memo[mid]=ans;
				nbPasMax=max(nbPasMax,ans[0]+ans[1]);
				if (mid-1>=deb) {
					interNouv.push_back({deb,mid-1});
				}
				if (mid+1<=fin) {
					interNouv.push_back({mid+1,fin});
				}
			}
		}
		interCour=interNouv;
	}
	calc(0,nbVal-1,0,0);
	return rep;
}

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80