Submission #1147332

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147332		leo12345	Coin Collecting (JOI19_ho_t4)	Java	0 / 100	94 ms	13016 KiB

joi2019_ho_t4

import java.util.*;

public class joi2019_ho_t4 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        int[][] coins = new int[2 * N][2];

        for (int i = 0; i < 2 * N; i++) {
            coins[i][0] = scanner.nextInt();
            coins[i][1] = scanner.nextInt();
        }

        Arrays.sort(coins, (a, b) -> {
            if (a[0] != b[0]) return Integer.compare(a[0], b[0]);
            return Integer.compare(a[1], b[1]);
        });

        List<int[]> targetPositions = new ArrayList<>();
        for (int x = 1; x <= N; x++) {
            targetPositions.add(new int[]{x, 1});
            targetPositions.add(new int[]{x, 2});
        }

        targetPositions.sort((a, b) -> {
            if (a[0] != b[0]) return Integer.compare(a[0], b[0]);
            return Integer.compare(a[1], b[1]);
        });

        long[][] dp = new long[2 * N + 1][2 * N + 1];
        for (int i = 0; i <= 2 * N; i++) Arrays.fill(dp[i], Long.MAX_VALUE / 2);
        dp[0][0] = 0;

        for (int i = 1; i <= 2 * N; i++) {
            for (int j = 1; j <= i; j++) {
                int cost = Math.abs(coins[i - 1][0] - targetPositions.get(j - 1)[0]) +
                           Math.abs(coins[i - 1][1] - targetPositions.get(j - 1)[1]);
                dp[i][j] = Math.min(dp[i - 1][j], dp[i - 1][j - 1] + cost);
            }
        }

        System.out.println(dp[2 * N][2 * N]);
    }
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 29
• Subtask 3: 0 / 63