Java 代码

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        int[] w = new int[N + 1];
        int[] val = new int[N + 1];
        int[] dp = new int[M + 1];
        Arrays.fill(dp, -1);
        dp[0] = 0;
        for (int i = 1; i <= N; i++) {
            w[i] = sc.nextInt();
            val[i] = sc.nextInt();
        }

        for (int i = 1; i <= M; i++) {
            for (int j = 1; j <= N; j++) {
                if (i - w[j] >= 0) {
                    dp[i] = Math.max(dp[i], dp[i - w[j]] + val[j]);
                }
            }
        }
        System.out.println(dp[M]);
    }
}