백준 9184

package baekjoon.DP;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main9184 {

   static int[][][] D = new int[21][21][21];

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      StringTokenizer st;
      int A, B, C;
      while (true) {
         st = new StringTokenizer(br.readLine());
         A = Integer.parseInt(st.nextToken());
         B = Integer.parseInt(st.nextToken());
         C = Integer.parseInt(st.nextToken());
         if (A == -1 && B == -1 && C == -1)
            break;
         System.out.printf("w(%d, %d, %d) = %d\n", A, B, C, go(A, B, C));
      }

   }

   //D[a][b][c]

   static int go(int a, int b, int c) {
      if (a <= 0 || b <= 0 || c <= 0) {
         return 1;
      } else if (a > 20 || b > 20 || c > 20) {
         return go(20, 20, 20);
      } else if (D[a][b][c] != 0) {
         return D[a][b][c];
      } else if (a < b && b < c) {
         return D[a][b][c] = go(a, b, c - 1) + go(a, b - 1, c - 1) - go(a, b - 1, c);
      }
      return D[a][b][c] = go(a - 1, b, c) + go(a - 1, b - 1, c) + go(a - 1, b, c - 1) - go(a - 1, b - 1, c - 1);
   }

}