[leetcode] Edit Distance

写code 常有漏写的问题。。要仔细点

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public class Solution { public int minDistance(String word1, String word2) { if (word1 == null || word2 == null) return 0; if (word1.equals("")) return word2.length(); if (word2.equals("")) return word1.length(); int oneL = word1.length(); int twoL = word2.length(); int[] lookup = new int[oneL+1]; for (int i = 0; i < oneL+1; i++){ lookup[i] = i; } for (int i = 1; i < twoL+1; i++){ int upLeft = i-1; lookup[0] = i; for (int j = 1; j < oneL+1; j++){ int temp = lookup[j]; lookup[j] = Math.min(lookup[j-1]+1, Math.min(lookup[j]+1, upLeft+diff(word1.charAt(j-1), word2.charAt(i-1)))); upLeft = temp; } } return lookup[oneL]; } public int diff(char a, char b){ return a==b?0:1; } }