Submission #961341

#	Time	Username	Problem	Language	Result	Execution time	Memory
961341		MinaRagy06	Aliens (IOI16_aliens)	C++17	12 / 100	117 ms	2424 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];
	vector<ll> v;
	for (int i = 0; i < n; i++) {
		a[i] = {r[i], c[i]};
		v.push_back(r[i]);
		v.push_back(c[i]);
	}
	v.push_back(-1);
	sort(v.begin(), v.end());
	v.resize(unique(v.begin(), v.end()) - v.begin());
	auto get = [&] (int x) {
		return lower_bound(v.begin(), v.end(), x) - v.begin();
	};
	n = v.size() - 1;
	ll mn[n + 1]{}, mx[n + 1]{};
	for (int i = 0; i <= n; i++) {
		mn[i] = 1e9;
		mx[i] = -1e9;
	}
	for (int i = 0; i < sz(r); i++) {
		a[i][0] = get(a[i][0]);
		a[i][1] = get(a[i][1]);
		mn[a[i][0]] = min(mn[a[i][0]], a[i][1]);
		mx[a[i][0]] = max(mx[a[i][0]], a[i][1]);
//		cout << "> " << a[i][0] << ' ' << a[i][1] << '\n';
	}
	ll dp[m + 1][n + 1]{};
	memset(dp, '?', sizeof dp);
	for (int j = 0; j <= m; j++) dp[j][0] = 0;
	for (int j = 1; j <= m; j++) {
		for (int i = 1; i <= n; i++) {
			ll curmn = 1e9, curmx = -1e9;
			for (int k = i; k >= 1; k--) {
				curmn = min(curmn, mn[k]);
				curmx = max(curmx, mx[k]);
//				if (j == m && i == n && k == 3) {
//					cout << "HI" << endl;
//				}
				if (k <= curmn && curmx <= i) {
					dp[j][i] = min(dp[j][i], dp[j - 1][k - 1] + (v[i] - v[k] + 1) * (v[i] - v[k] + 1));
				}
			}
		}
	}
//	cout << dp[1][2] << '\n';
	return dp[m][n];
}

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