Submission #962524

#	Time	Username	Problem	Language	Result	Execution time	Memory
962524		MinaRagy06	Aliens (IOI16_aliens)	C++17	25 / 100	2060 ms	6748 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()

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 dp[m + 1][n + 1];
	memset(dp, '?', sizeof dp);
	for (int j = 0; j <= m; j++) {
		dp[j][0] = 0;
	}
	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]);
	}
	for (int j = 1; j <= m; j++) {
		for (int i = 1; i <= n; i++) {
			ll mx = -1e18;
			for (int k = i; k >= 1; k--) {
				mx = max(mx, a[k][1]);
				ll c = (mx - prf[k]) * (mx + prf[k] - 2 * a[k][0]);
				if (c < 0) continue;
				dp[j][i] = min(dp[j][i], dp[j - 1][k - 1] + c);
			}
		}
	}
	for (int i = 2; i + 1 <= m; i++) {
		assert(dp[i][n] - dp[i - 1][n] <= dp[i + 1][n] - dp[i][n]);
	}
	return dp[m][n];
}

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