From 6ff87322e63e167cf62dc1bb94eb426c27a52649 Mon Sep 17 00:00:00 2001 From: Libin Yang Date: Sat, 23 Feb 2019 21:06:32 +0800 Subject: [PATCH] docs(DP): update EggDropping.java --- Dynamic Programming/EggDropping.java | 98 +++++++++++++--------------- 1 file changed, 46 insertions(+), 52 deletions(-) diff --git a/Dynamic Programming/EggDropping.java b/Dynamic Programming/EggDropping.java index 382d7ea8..0549f664 100644 --- a/Dynamic Programming/EggDropping.java +++ b/Dynamic Programming/EggDropping.java @@ -1,53 +1,47 @@ -//Dynamic Programming 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]; - } - - //testing program - 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); - } +/** + * Dynamic Programming 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); + } }