Submission #838005

#	Time	Username	Problem	Language	Result	Execution time	Memory
838005		pavement	Shortcut (IOI16_shortcut)	C++17	0 / 100	1 ms	212 KiB

shortcut

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

#define mp make_pair

using ll = long long;

ll find_shortcut(int n, vector<int> l, vector<int> d, int c) {
	vector<ll> x(n, 0);
	for (int i = 0; i + 1 < n; i++) {
		x[i + 1] = x[i] + l[i];
	}
	
	auto good = [&](ll k) {
		ll min_x = -(ll)1e18, max_x = (ll)1e18, min_y = -(ll)1e18, max_y = (ll)1e18;
		for (int i = 0; i < n; i++) {
			for (int j = i + 1; j < n; j++) {
				if ((ll)d[i] + (ll)d[j] + x[j] - x[i] > k) {
					ll v = k - (ll)c - (ll)d[i] - (ll)d[j];
					auto lower_left = mp(x[i] - v - x[j], x[i] - v + x[j]);
					auto upper_right = mp(x[i] + v - x[j], x[i] + v + x[j]);
					min_x = max(min_x, lower_left.first);
					max_x = min(max_x, upper_right.first);
					min_y = max(min_y, lower_left.second);
					max_y = min(max_y, upper_right.second);
				}
			}
		}
		return min_x <= max_x && min_y <= max_y;
	};
	
	ll lo = 0, hi = (ll)1e16, ans = -1;
	while (lo <= hi) {
		ll mid = (lo + hi) / 2;
		if (good(mid)) {
			ans = mid;
			hi = mid - 1;
		} else {
			lo = mid + 1;
		}
	}
	
	return ans;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3