Submission #29506

#	Time	Username	Problem	Language	Result	Execution time	Memory
29506		inqr	Rice Hub (IOI11_ricehub)	C++14	58 / 100	39 ms	6708 KiB

ricehub

#include "ricehub.h"
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define rt insert
#define st first
#define nd second
#define ll long long
using namespace std;
vector < ll > presum;
ll fienum;
int ans;
ll b;
ll sum(ll l,ll r){
	if(l==0)return presum[r];
	else return presum[r]-presum[l-1];
}
ll comp(ll l,ll r,int X[]){
	ll m=(l+r)/2;
	ll lc=m-l,rc=r-m;
	return lc*X[m]-sum(l,m-1)+sum(m+1,r)-rc*X[m];
}
void solve(ll s,int X[]){
	ll l=s,r=fienum-1;
	while(l<=r){
		ll m=(l+r)/2;
		//printf("s=%d l=%d r=%d m=%d comp=%d %d\n",s,l,r,m,comp(s,m,X).st,comp(s,m,X).nd);
		if(comp(s,m,X)<=b){
			l=m+1;
			ans = (int)(m-s+1>ans) ? m-s+1 : ans;
		}
		else r=m-1;
	}
}
int besthub(int R, int L, int X[], ll B)
{
	fienum=R;b=B;
	presum.resize(R);
	presum[0]=X[0];
	for(int i=1;i<R;i++)presum[i]=presum[i-1]+X[i];
	for(int i=0;i<R;i++){
		solve(i,X);
	}
	return ans;
}

• Subtask 1: 0 / 17
• Subtask 2: 0 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32