Submission #962548

#	Time	Username	Problem	Language	Result	Execution time	Memory
962548		MinaRagy06	Aliens (IOI16_aliens)	C++17	25 / 100	2045 ms	752 KiB

aliens

#include <bits/stdc++.h>
#include "aliens.h"
#ifdef MINA
#include "grader.cpp"
#endif
using namespace std;
#define ll long long
#define sz(x) (int) x.size()

const int N = 100'005;
const ll inf = 1e18;
array<ll, 2> dp[N];
ll take_photos(int n, int crap, int m, vector<int> R, vector<int> C) {
	array<ll, 2> a[n + 1];
	vector<ll> v;
	for (int i = 1; i <= n; i++) {
		a[i] = {R[i - 1], C[i - 1]};
		if (a[i][0] > a[i][1]) swap(a[i][0], a[i][1]);
	}
	sort(a + 1, a + n + 1);
	ll prf[n + 2]{};
	prf[1] = -1e18;
	for (int i = 1; i <= n; i++) {
		prf[i + 1] = max(prf[i], a[i][1]);
		a[i][0]--;
		prf[i] = max(prf[i], a[i][0]);
	}
	auto check = [&] (ll c) {
		for (int i = 1; i <= n; i++) {
			dp[i] = {inf, inf};
		}
		dp[0] = {0, 0};
		for (int i = 1; i <= n; i++) {
			ll mx = -inf;
			for (int k = i; k >= 1; k--) {
				mx = max(mx, a[k][1]);
				ll cost = (mx - prf[k]) * (mx + prf[k] - 2 * a[k][0]) + c;
				if (cost < 0) continue;
				array<ll, 2> val = dp[k - 1];
				val[0] += cost;
				val[1]++;
				dp[i] = min(dp[i], val);
			}
		}
		return dp[n][1] <= m;
	};
	ll l = 0, r = inf;
	while (l <= r) {
		ll md = ((l + r) >> 1);
		if (check(md)) {
			r = md - 1;
		} else {
			l = md + 1;
		}
	}
	ll k = l;
	check(k);
	return dp[n][0] - k * m;
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40