Submission #773573

#	Time	Username	Problem	Language	Result	Execution time	Memory
773573		Jomnoi	Aliens (IOI16_aliens)	C++17	0 / 100	53 ms	2256 KiB

aliens

#include <bits/stdc++.h>
#include "aliens.h"
using namespace std;

const int MAX_K = 1005;
const int MAX_N = 1005;
const long long INF = 1e18 + 7;

int N, M, K;
int id[MAX_N];
long long dp[MAX_K][MAX_N];
bool dead[MAX_N];

long long take_photos(int n, int m, int k, vector <int> r, vector <int> c) {
    N = n, M = m, K = k;

    if (K == N) {
        int cnt = N;
        for (int i = 0; i < N; i++) {
            for (int j = 0; j < N; j++) {
                if (i == j) continue;
                int l1 = r[i] + c[i] - abs(r[i] - c[i]), r1 = r[i] + c[i] + abs(r[i] - c[i]);
                int l2 = r[j] + c[j] - abs(r[j] - c[j]), r2 = r[j] + c[j] + abs(r[j] - c[j]);

                if (l1 <= l2 and r2 <= r1) dead[j] = true;
            }
        }
        for (int i = 0; i < N; i++) if (dead[i] == true) cnt--;
        return cnt;
    }

    for (int i = 0; i < N; i++) id[i] = i;
    
    sort(id, id + N, [&](const int &a, const int &b) {
        return r[a] < r[b];
    });

    for (int i = 1; i <= N; i++) dp[0][i] = INF;
    for (int k = 1; k <= K; k++) {
        for (int i = 1; i <= N; i++) {
            dp[k][i] = INF;

            for (int j = i; j >= 1; j--) {
                long long cost = (r[id[i - 1]] - r[id[j - 1]] + 1) * (r[id[i - 1]] - r[id[j - 1]] + 1);
                dp[k][i] = min(dp[k][i], cost + dp[k - 1][j - 1]);
            }
        }
    }

    long long ans = INF;
    for (int k = 1; k <= K; k++) ans = min(ans, dp[k][N]);
    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