Submission #469994

#	Time	Username	Problem	Language	Result	Execution time	Memory
469994		ImaginaryIQ	Knapsack (NOI18_knapsack)	Java	37 / 100	221 ms	14324 KiB

knapsack

import java.util.*;
import java.io.*;

public class knapsack {

    static int s, n;
    static long [][] arr;
    static long [][] dp; // dp[i][j][k] = the maximmum amount of value that we can using the first i items,
    // without exceeding weight j, while picking a max of k times
    public static void main(String[] args) throws Exception {
        Scanner io = new Scanner(System.in);
        s = io.nextInt();
        n = io.nextInt();

        arr = new long[n+1][3]; // v, w, count
        dp = new long[n+1][s+1];

        for (int i = 1; i <= n; i++) {
            arr[i][0] = io.nextInt(); // value, weight, and, number of picks
            arr[i][1] = io.nextInt();
            arr[i][2] = io.nextInt();
        }

        dp [0][0] = 0;
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j <= s; j++) {
                dp[i][j] = dp[i-1][j];

                // go back the number of times taken
                for (int k = 1; k <= Math.min(arr[i][2], n); k++) {
                    long prev = j - (arr[i][1] * k);
                    if (prev >= 0) {
                        dp[i][j] = Math.max(dp[i-1][(int)prev] + arr[i][0] * k, dp[i][j]);
                    }
                }
            }
        }

        long ans = 0;
        for (int i = 0; i <= s; i++) {
            ans = Math.max(dp[n][i], ans);
        }
        
        System.out.println(ans);
        io.close();
    }

    static class pair implements Comparable<pair>{
        int p1, p2;
        public pair(int p1, int p2){
            this.p1 = p1;
            this.p2 = p2;
        }

        @Override
        public int compareTo(pair o) {
            return Integer.compare(this.p1, o.p1);
        }
    }
}

• Subtask 1: 0 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27