Submission #284598

#	Time	Username	Problem	Language	Result	Execution time	Memory
284598		A02	Aliens (IOI16_aliens)	C++14	16 / 100	124 ms	1280 KiB

aliens

#include <vector>
#include <string>
#include <set>
#include <algorithm>
#include <iostream>
#include <utility>

#include "aliens.h"

using namespace std;

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {

    if (k == n && m <= 100){

        int total = 0;
        for (int i = 0; i < m; i++){
            for (int j = 0; j < m; j++){
                bool good = false;

                for (int a = 0; a < n; a++){
                    if (i <= max(r[a], c[a]) && j <= max(r[a], c[a]) && i >= min(r[a], c[a]) && j >= min(r[a], c[a])){
                        good = true;
                    }
                }

                if (good){
                    total++;
                }
            }
        }

        return total;

    }

    bool is_central = true;

    for (int i = 0; i < n; i++){
        if (r[i] != c[i]){
            is_central = false;
        }
    }

    if (is_central && n <= 500 && m <= 1000){

        vector<int> locations;

        for (int i = 0; i < n; i++){
            if (find(locations.begin(), locations.end(), r[i]) == locations.end()){
                locations.push_back(r[i]);
            }
        }

        sort(locations.begin(), locations.end());

        n = locations.size();

        vector<vector<int> > DPnk (n, vector<int> (k + 1, m * m));

        for (int N = 0; N < n; N++){
            for (int K = 1; K <= k; K++){

                DPnk[N][K] = (locations[N] - locations[0] + 1) * (locations[N] - locations[0] + 1);

                for (int n1 = 1; n1 <= N; n1++){
                    DPnk[N][K] = min(DPnk[N][K], DPnk[n1 - 1][K - 1] + (locations[N] - locations[n1] + 1) * (locations[N] - locations[n1] + 1));
                }

            }
        }

        return DPnk[n - 1][k];

    }

    return -5;
}

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