Submission #67564

#	Time	Username	Problem	Language	Result	Execution time	Memory
67564		Hoget157	Rice Hub (IOI11_ricehub)	C++14	100 / 100	44 ms	17280 KiB

ricehub

#include <bits/stdc++.h>
#define ll long long
using namespace std;

ll n,m,x[100010],b,l[100010] = {},r[100010] = {};

bool C(ll mid,ll num){
	ll A = num / 2,B = num - num / 2 - 1;
	ll mi = 1e+18;
	if(mid + A + 1 <= n && mid - B >= 0) mi = l[mid + A + 1] - l[mid + 1] - x[mid] * A + r[mid - B] - r[mid] - (m - x[mid]) * B;
	if(num % 2 == 0 && mid + B + 1 <= n && mid - A >= 0) mi = min(mi,l[mid + B + 1] - l[mid + 1] - x[mid] * B + r[mid - A] - r[mid] - (m - x[mid]) * A);
	return mi <= b;
}

int besthub(int R, int L, int X[], long long B){
	n = R,m = L,b = B;
	for(ll i = 0;i < n;i++) x[i] = X[i];
	ll ma = 0;
	for(ll i = 0;i < n;i++) l[i + 1] = l[i] + x[i];
	for(ll i = n - 1;i >= 0;i--) r[i] = r[i + 1] + L - x[i];
	for(ll i = 0;i < n;i++){
		ll low = 1,up = n + 1;
		while(up - low > 1){
			ll mid = (up + low) / 2;
			if(C(i,mid)) low = mid;
			else up = mid;
		}
		ma = max(ma,low);
		//for(int j = 1;j <= n;j++) C(i,j);
	}
	return ma;
}

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