Submission #1148126

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148126		leo12345	Coin Collecting (JOI19_ho_t4)	Java	0 / 100	64 ms	13124 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);

        int N = Integer.parseInt(bufferedReader.readLine());

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

        int minTotalMovesY = 0;

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

            if ((x >= 1 && x <= N) && (y == 1 || y == 2)) {
                coinsPositions[i][0] = Integer.MIN_VALUE;
                coinsPositions[i][1] = Integer.MIN_VALUE;

                positionsNotAvailable.put(x + "" + y, 0);
            } else {

                coinsPositions[i][0] = x;
                coinsPositions[i][1] = y;

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

                    coinsPositions[i][0] = Integer.MIN_VALUE;
                    coinsPositions[i][1] = Integer.MIN_VALUE;

                }
            }
        }

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

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

        long minTotalMovesX = 0;

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


        printWriter.print(minTotalMovesX + minTotalMovesY);

        printWriter.flush();
    }


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

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

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

        dp[0][0] = 0;

        long minimumOperationsX = 0;

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

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

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

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

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

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

        }

        return minimumOperationsX;

    }

}

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