参考代码:
import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int[] ar = new int[n]; for (int i = 0; i < n; i++) { ar[i] = sc.nextInt(); } int[] dp = new int[200000]; dp[0] = 0; int m = 0,count = 0; for (int i = 1; i < dp.length; i++) { dp[i] = Integer.MAX_VALUE; for (int j = 0; j < ar.length; j++) { if (i >= ar[j] && dp[i - ar[j]] != Integer.MAX_VALUE) { dp[i] = Math.min(dp[i - ar[j]], dp[i]); } } if (dp[i] == Integer.MAX_VALUE){ count++; m = 0; }else { m++; if (m > 1000){ System.out.println(count); return; } } } System.out.println("INF"); } }
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