http://poj.org/problem?id=3181 //* @author:alpc12 import java.io.*; import java.util.*; import java.math.*; public class Main { final int N = 1010; BigInteger[] dp = new BigInteger[N]; void run() { Scanner cin = new Scanner(System.in); while(cin.hasNext()) { int i, j; int n = cin.nextInt(), k = cin.nextInt(); for(i = 1; i <= n; ++i) dp[i] = BigInteger.ZERO; dp[0] = BigInteger.ONE; for(i = 1; i <= k; ++i) { for(j = 0; j + i <= n; ++j) dp[j+i] = dp[j+i].add(dp[j]); } System.out.println(dp[n]); } } public static void main(String[] args) { new Main().run(); } }
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