Submission #763735

#	Time	Username	Problem	Language	Result	Execution time	Memory
763735		mousebeaver	Aliens (IOI16_aliens)	C++17	0 / 100	1 ms	224 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
#define ll long long
#define INF numeric_limits<ll>::max()/2
#define pll pair<ll, ll>
using namespace std;

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c)
{
    vector<pll> a(n);
    for(ll i = 0; i < n; i++)
    {
        a[i] = {r[i], c[i]};
        if(c[i] < r[i]) //Mirror to diagonal or above
        {
            swap(a[i].first, a[i].second);
        }
    }

    sort(a.begin(), a.end());
    vector<pll> b(0);
    for(ll i = 0; i < n; i++)
    {
        if((i == n-1 || a[i].first != a[i+1].first) && (b.empty() || a[i].second > b.back().second))
        {
            b.push_back(a[i]);
        }
    }
    a = b;
    n = a.size();

    vector<vector<ll>> dp(n+1, vector<ll> (k+1, INF));
    dp[0][0] = 0;
    for(ll i = 1; i <= n; i++)
    {
        for(ll j = 1; j <= k; j++)
        {
            dp[i][j] = dp[i][j-1];
            for(ll b = 1; b <= i; b++)
            {
                ll val = dp[b-1][j-1];
                ll root = max(a[i-1].second-a[i-1].first+1, a[b-1].second-a[b-1].first+1);
                ll area = root*root; //Area of the necessary square to cover the given cells
                if(b > 1 && a[b-1].first <= a[b-2].second)
                {
                    //Calculate the overlap with the previous square
                    root = a[b-2].second-a[b-1].first+1;
                    area -= root*root;

                }
                val += area;
                dp[i][j] = min(dp[i][j], val);
            }
        }
    }

    return dp[n][k];
}

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