Submission #1117038

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117038		Zflop	Rice Hub (IOI11_ricehub)	C++14	100 / 100	15 ms	5712 KiB

ricehub

#include <bits/stdc++.h>
using namespace std;
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
const int NMAX = (int)1e5 * 2;
long long pref_val[NMAX],suf_val[NMAX];
int besthub(int R, int L, int X[], long long B) {
	for (int i = 0; i < R;++i) {
		pref_val[i] = X[i];
		if (i) {
			pref_val[i] += pref_val[i - 1];
			} 
		}
	for (int i = R - 1; i >= 0;--i) {
		suf_val[i] = suf_val[i + 1] + L - X[i];
		}
	
	int l = 1,r = R;
	int ans = 1;
	while (l <= r) {
		long long mid = (l + r) / 2;
		//cout << mid << ' ' << "here\n";
		bool ok = false;
		for (long long i = 0; i < R - mid + 1;++i) {
			long long id = i + mid / 2;
			long long left_part = suf_val[i] - suf_val[id] - (id - i) * (L - X[id]);
			long long right_part = pref_val[i + mid - 1] - pref_val[id] - (mid - (id - i) - 1) * X[id];
			long long cost = left_part + right_part;
			//cout << cost << ' ' << mid << ' ' << left_part << ' ' << right_part << '\n';
			if (cost <= B) 
				ok = true;
			}
		if (ok) {
			ans = mid;
			l = mid + 1;
			}
		else 
			r = mid - 1;
		}
	return ans;
	}

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