Submission #1148135

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148135		leo12345	Coin Collecting (JOI19_ho_t4)	Java	0 / 100	71 ms	13400 KiB

joi2019_ho_t4

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

public class joi2019_ho_t4 {

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter printWriter = new PrintWriter(System.out);

        long N = Long.parseLong(bufferedReader.readLine());

        long[][] coinsPositions = new long[(int)(N * 2)][2];
        Map<String, Long> positionsNotAvailable = new HashMap<>();

        long minTotalMovesY = 0;

        for (long i = 0; i < 2 * N; i++) {
            String[] positionXY = bufferedReader.readLine().split(" ");
            long x = Long.parseLong(positionXY[0]);
            long y = Long.parseLong(positionXY[1]);

            if ((x >= 1 && x <= N) && (y == 1 || y == 2)) {

                if (!positionsNotAvailable.containsKey(x + "" + y)) {
                    positionsNotAvailable.put(x + "" + y, 0L);
                    coinsPositions[(int)i][0] = Long.MIN_VALUE;
                    coinsPositions[(int)i][1] = Long.MIN_VALUE;
                } else {
                    coinsPositions[(int)i][0] = x;
                    coinsPositions[(int)i][1] = y;
                }
            } else {

                coinsPositions[(int)i][0] = x;
                coinsPositions[(int)i][1] = y;

                if (coinsPositions[(int)i][1] < 1) {
                    long resultY = Math.abs(coinsPositions[(int)i][1] - 1);
                    coinsPositions[(int)i][1] = 1;
                    minTotalMovesY += resultY;
                } else if (coinsPositions[(int)i][1] > 2) {
                    long resultY = Math.abs(coinsPositions[(int)i][1] - 2);
                    coinsPositions[(int)i][1] = 2;
                    minTotalMovesY += resultY;
                }
                if ((coinsPositions[(int)i][0] >= 1 && coinsPositions[(int)i][0] <= N) && (coinsPositions[(int)i][1] == 1 || coinsPositions[(int)i][1] == 2)) {
                    if (!positionsNotAvailable.containsKey(x + "" + y)) {
                        positionsNotAvailable.put(x + "" + y, 0L);
                        coinsPositions[(int)i][0] = Long.MIN_VALUE;
                        coinsPositions[(int)i][1] = Long.MIN_VALUE;
                    } else {
                        coinsPositions[(int)i][0] = x;
                        coinsPositions[(int)i][1] = y;
                    }
                }
            }
        }

        Arrays.sort(coinsPositions, (a, b) -> {
            long distA = Math.abs(a[0] - 1);
            long distB = Math.abs(b[0] - 1);
            if (distA != distB) {
                return Long.compare(distA, distB);
            }

            return Long.compare(Math.abs(a[0] - N), Math.abs(b[0] - N));
        });

        long minTotalMovesX = 0;

        if ((2 * N) - positionsNotAvailable.size() > 1) {
            minTotalMovesX = minimumMoves(coinsPositions, N, (int)((2 * N) - positionsNotAvailable.size()), positionsNotAvailable);
        }

        printWriter.print(minTotalMovesX + minTotalMovesY);

        printWriter.flush();
    }

    public static long minimumMoves(long[][] coinsPositions, long N, int numberCoins, Map<String, Long> positionsNotAvailable) {

        long[][] dp = new long[numberCoins][(int)(N * 2 + 1)];

        for (long[] row : dp) {
            Arrays.fill(row, 0L);
        }

        dp[0][0] = 0;

        long minimumOperationsX = 0;

        for (int i = 0; i < numberCoins; i++) {
            long minMoveForRow = Long.MAX_VALUE;
            long positionNotAvailableX = 0;
            long positionNotAvailableY = 0;

            for (long j = 1; j <= 2 * N; j++) {

                long positionAvailableX = j;
                long positionAvailableY = 1;
                if (positionAvailableX > N) {
                    positionAvailableX = j % N;
                    if (positionAvailableX == 0) {
                        positionAvailableX = N;
                    }
                    positionAvailableY = 2;
                }

                if (!positionsNotAvailable.containsKey(positionAvailableX + "" + positionAvailableY)) {
                    dp[i][(int)j] = Math.abs(coinsPositions[i][0] - positionAvailableX);
                    if (coinsPositions[i][1] == 1 && j > N) {
                        dp[i][(int)j]++;
                    } else if (coinsPositions[i][1] == 2 && j <= N) {
                        dp[i][(int)j]++;
                    }

                    if (dp[i][(int)j] < minMoveForRow) {
                        minMoveForRow = dp[i][(int)j];
                        positionNotAvailableX = positionAvailableX;
                        positionNotAvailableY = positionAvailableY;
                    }
                }
            }

            if (minMoveForRow != Long.MAX_VALUE) {
                minimumOperationsX += minMoveForRow;
                positionsNotAvailable.put(positionNotAvailableX + "" + positionNotAvailableY, minMoveForRow);
            }

        }

        return minimumOperationsX;
    }
}

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