Submission #274928

#	Time	Username	Problem	Language	Result	Execution time	Memory
274928		ggooroo	Aliens (IOI16_aliens)	C++14	0 / 100	9 ms	640 KiB

aliens

#include "aliens.h"
#include<iostream>
#include<cstdio>
#include<algorithm>
#define N 4005
#define F first
#define S second
typedef long long ll;

using namespace std;
ll i, j, M, d[N][N];
struct st {
	ll ri, ci, z;
} a[N];

bool comp(st p, st q) {
	return p.ci < q.ci;
}

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
	ll i, j, w, pl, ans, t1, t2, en, mn;
	for (i = n; i >= 1; i--) {
		r[i] = r[i - 1];
		c[i] = c[i - 1];
	}
	for (i = 1; i <= n; i++) {
		r[i]++;
		c[i]++;
		if (r[i] > c[i]) swap(r[i], c[i]);
		a[i].ri = r[i];
		a[i].ci = c[i];
		a[i].z = i;
	}
	a[0].ri = a[0].ci = a[0].z = 0;
	sort(a + 1, a + n + 1, comp);
	M = m * m;
	for (i = 0; i <= n; i++) {
		en = i;
		if (k < i) en = k;
		for (j = 0; j <= en;j++) d[i][j] = M;
	}
	ans = M;
	d[0][0] = 0;
	for (i = 1; i <= n; i++) {
		en = i;
		if (k < i) en = k;
		for (j = 1; j <= en; j++) {
			d[i][j] = M;
			mn = a[i].ri;
			for (w = i - 1; w >= 0; w--) {
				t1 = a[w].ci;
				t2 = mn;
				pl = max(t1 - t2 + 1, 0ll);
				d[i][j] = min(d[i][j], d[w][j - 1] - pl * pl + (a[i].ci - mn + 1) * (a[i].ci - mn + 1));
				if (a[w].ri < mn) mn = a[w].ri;
			}
			if (i == n) ans = min(ans, d[i][j]);
		}
	}
    return ans;
}

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