Submission #1148102

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148102		humerez_s	Coin Collecting (JOI19_ho_t4)	Java	Compilation error	0 ms	0 KiB

joi2019_ho_t4

import java.util.*;

public class Main {
    static int n;
    static List<Integer> xCoords = new ArrayList<>();
    static List<Integer> yCoords = new ArrayList<>();

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        n = sc.nextInt();
        int totalCoins = 2 * n;

        for (int i = 0; i < totalCoins; i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            xCoords.add(x);
            yCoords.add(y);
        }

        // Ordenar para minimizar el movimiento
        Collections.sort(xCoords);
        Collections.sort(yCoords);

        // Generar posiciones objetivo
        List<Integer> targetX = new ArrayList<>();
        List<Integer> targetY = new ArrayList<>();

        for (int i = 1; i <= n; i++) {
            targetX.add(i);
            targetX.add(i);
        }
        for (int i = 1; i <= n; i++) {
            targetY.add(1);
        }
        for (int i = 1; i <= n; i++) {
            targetY.add(2);
        }

        // Verificar tamaño correcto
        if (targetX.size() != totalCoins || targetY.size() != totalCoins) {
            System.err.println("Error: Los tamaños de targetX o targetY no coinciden.");
            return;
        }

        // Aplicar DP con Knapsack 0/1
        long result = calculateMinimumMoves(targetX, targetY);
        System.out.println(result);
        sc.close();
    }

    private static long calculateMinimumMoves(List<Integer> targetX, List<Integer> targetY) {
        int size = xCoords.size();
        long[][] dp = new long[size + 1][size + 1];

        // Llenar DP con valores grandes (Infinity)
        for (int i = 0; i <= size; i++) {
            Arrays.fill(dp[i], Long.MAX_VALUE);
        }
        dp[0][0] = 0; // Caso base

        // Aplicar DP estilo Knapsack 0/1 sin repetición
        for (int i = 1; i <= size; i++) {
            for (int j = 1; j <= size; j++) {
                long moveCost = Math.abs(xCoords.get(i - 1) - targetX.get(j - 1)) +
                        Math.abs(yCoords.get(i - 1) - targetY.get(j - 1));

                if (dp[i - 1][j - 1] != Long.MAX_VALUE) {
                    dp[i][j] = Math.min(dp[i - 1][j - 1] + moveCost, dp[i - 1][j]);
                } else {
                    dp[i][j] = dp[i - 1][j];
                }
            }
        }

        return dp[size][size];
    }
}

Compilation message (stderr)

joi2019_ho_t4.java:4: error: class Main is public, should be declared in a file named Main.java
public class Main {
       ^
1 error

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