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Given a list of unique words. Find all pairs of distinct indices (i, j) in the given list, so that the concatenation of the two words, i.e. words[i] + words[j] is a palindrome.
Example 1:
Given words = ["bat", "tab", "cat"]
Return [[0, 1], [1, 0]]
The palindromes are ["battab", "tabbat"]
Example 2:
Given words = ["abcd", "dcba", "lls", "s", "sssll"]
Return [[0, 1], [1, 0], [3, 2], [2, 4]]
The palindromes are ["dcbaabcd", "abcddcba", "slls", "llssssll"]
方法一：暴力解法
public class PalindromePairs { public boolean isPalindrome(String string) { char c[]=string.toCharArray(); boolean flag=true; for (int i = 0; i < c.length/2; i++) { if (c[i]!=c[c.length-i-1]) { flag=false; break; } } return flag; } public List<List<Integer>> palindromePairs(String[] words) { List<List<Integer>> b= new ArrayList<List<Integer>>(); for (int i = 0; i < words.length; i++) { for (int j = 0; j < words.length; j++) { if (i!=j) { String string=words[i]+words[j]; if (isPalindrome(string)) { List<Integer> a= new ArrayList<Integer>(); a.add(i); a.add(j); b.add(a); } } } } return b; } public static void main(String[] args) { String [] words={"hijajcd","hjhgahbcegj"}; PalindromePairs pairs=new PalindromePairs(); System.out.println(pairs.palindromePairs(words)); } }
方法二：
import java.util.ArrayList;import java.util.List;
public class PalindromePairs {public boolean isPalindrome(String string) {char c[]=string.toCharArray();boolean flag=true;for (int i = 0; i < c.length/2; i++) {if (c[i]!=c[c.length-i-1]) {flag=false;break;}}return flag;} public List<List<Integer>> palindromePairs(String[] words) { List<List<Integer>> b= new ArrayList<List<Integer>>(); for (int i = 0; i < words.length; i++) {for (int j = 0; j < words.length; j++) {if (i!=j) {String string=words[i]+words[j];if (isPalindrome(string)) {List<Integer> a= new ArrayList<Integer>();a.add(i);a.add(j);b.add(a);}}}} return b; }public static void main(String[] args) {String [] 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pairs=new PalindromePairs();System.out.println(pairs.palindromePairs(words));}
}
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原文地址：http://www.cnblogs.com/zoghin/p/5451823.html
