JavaAlgorithms/DynamicProgramming/EggDropping.java

package DynamicProgramming;

/** DynamicProgramming solution for the Egg Dropping Puzzle */
public class EggDropping {

  // min trials with n eggs and m floors

  private static int minTrials(int n, int m) {

    int[][] eggFloor = new int[n + 1][m + 1];
    int result, x;

    for (int i = 1; i <= n; i++) {
      eggFloor[i][0] = 0; // Zero trial for zero floor.
      eggFloor[i][1] = 1; // One trial for one floor
    }

    // j trials for only 1 egg

    for (int j = 1; j <= m; j++) eggFloor[1][j] = j;

    // Using bottom-up approach in DP

    for (int i = 2; i <= n; i++) {
      for (int j = 2; j <= m; j++) {
        eggFloor[i][j] = Integer.MAX_VALUE;
        for (x = 1; x <= j; x++) {
          result = 1 + Math.max(eggFloor[i - 1][x - 1], eggFloor[i][j - x]);

          // choose min of all values for particular x
          if (result < eggFloor[i][j]) eggFloor[i][j] = result;
        }
      }
    }

    return eggFloor[n][m];
  }

  public static void main(String args[]) {
    int n = 2, m = 4;
    // result outputs min no. of trials in worst case for n eggs and m floors
    int result = minTrials(n, m);
    System.out.println(result);
  }
}