Submission #207782

#	Time	Username	Problem	Language	Result	Execution time	Memory
207782		peuch	Rice Hub (IOI11_ricehub)	C++17	100 / 100	24 ms	2296 KiB

ricehub

#include "ricehub.h"
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 2000000;
long long sumD[MAXN], sumE[MAXN];

bool test(long long ini, long long fim, int R, long long B, int X[]);

int besthub(int R, int L, int X[], long long B)
{	
    	long long ans = 0;
        sumD[0] = X[0]; 
        sumE[R - 1] = 0;
    	for(int i = R - 2; i >= 0; i--)
    		sumE[i] = sumE[i + 1] + X[R - 1] - X[i];
    	for(int i = 1; i < R; i++)
    		sumD[i] = sumD[i - 1] + X[i];
    	for(long long ini = 0, fim = 0; ini < R; ini++){
    		while(test(ini, fim, R, B, X) && fim < R) fim++;
    		ans = max(fim - ini, ans);
    	}
    	return (int)ans;
}

bool test(long long ini, long long fim, int R, long long B, int X[]){
    long long m = (ini + fim) >> 1;
    long long left = sumE[ini] - sumE[m] - (m - ini) * (X[R - 1] - X[m]);
    long long right = sumD[fim] - sumD[m] - (fim - m) * X[m];
  	return left + right <= B;
}

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