Submission #893998

#	Time	Username	Problem	Language	Result	Execution time	Memory
893998		sushikid	Knapsack (NOI18_knapsack)	Java	73 / 100	368 ms	262144 KiB

knapsack

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

public class knapsack {
    public static void main(String[] args) throws IOException{
        BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter pw = new PrintWriter(System.out);
        StringTokenizer st = new StringTokenizer(r.readLine());
        int s = Integer.parseInt(st.nextToken()); int n = Integer.parseInt(st.nextToken());
        HashMap<Integer, ArrayList<int[]>> weight = new HashMap<>();
        long[][] dp = new long[s + 1][n + 1]; //max value that can be obtained when the sum of weights is [s + 1] and the current weight your on is [n + 1]
        for (int i = 0; i <= s; i++) {
            Arrays.fill(dp[i], -1);
        }
        dp[0][0] = 0;
        for (int i = 0; i < n; i++) {
            st = new StringTokenizer(r.readLine());
            int v = Integer.parseInt(st.nextToken()); int w = Integer.parseInt(st.nextToken()); int k = Integer.parseInt(st.nextToken());
            if(!weight.containsKey(w)){
                weight.put(w, new ArrayList<>());
            }
            weight.get(w).add(new int[]{v, k});
        }
        
        int cur_Use = 1;
        for (int e : weight.keySet()) {
            ArrayList<int[]> arr = weight.get(e);
            Collections.sort(arr, (a, b) -> -Integer.compare(a[0], b[0]));
            // System.out.print(e + " ");
            // for(int[] z : arr){
            //     System.out.print(Arrays.toString(z));
            // }
            for (int j = 0; j <= s; j++) {
                dp[j][cur_Use] = dp[j][cur_Use - 1];
                int amt = 0;
                int idx = 0;
                int val = 0;
                int used = 0;
                while((amt + 1) * e <= j && idx < arr.size()){
                    amt++;
                    val += arr.get(idx)[0];
                    if(dp[j - (amt) * e][cur_Use - 1] != -1){
                        dp[j][cur_Use] = Math.max(dp[j][cur_Use], 
                                                    dp[j - amt * e][cur_Use - 1] + val);
                    }
                    used++;
                    if(used == arr.get(idx)[1]){
                        used = 0;
                        idx++;
                    }
                }
            }
            cur_Use++;
        }
        long ans = 0;
        for (int i = 0; i <= s; i++) {
            ans = Math.max(ans, dp[i][weight.size()]);
        }
        pw.println(ans);
        pw.close();
    }
    /*
    public static void main(String[] args) throws IOException{
        BufferedReader r = new BufferedReader(new FileReader("test.in"));
        PrintWriter pw = new PrintWriter(System.out);
        StringTokenizer st = new StringTokenizer(r.readLine());
        int s = Integer.parseInt(st.nextToken()); int n = Integer.parseInt(st.nextToken());
        int[][] options = new int[n][3];
        for (int i = 0; i < n; i++) {
            st = new StringTokenizer(r.readLine());
            int v = Integer.parseInt(st.nextToken()); int w = Integer.parseInt(st.nextToken()); int k = Integer.parseInt(st.nextToken());
            options[i][0] = v;
            options[i][1] = w;
            options[i][2] = k;
        }
        int[] dp = new int[s + 1]; Arrays.fill(dp, -1); dp[0] = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j <= s; j++) {
                if(dp[j] != -1){    
                    
                    for (int j2 = 0; j2 < dp.length; j2++) {
                        
                    }
                }
            }
            System.out.println(i + " " + Arrays.toString(dp));
        }
    }
    */
}

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