longest-common-subsequence
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中等 最长公共子序列
37%
通过
给出两个字符串,找到最长公共子序列(LCS),返回LCS的长度。
您在真实的面试中是否遇到过这个题?Yes
样例
给出"ABCD" 和 "EDCA",这个LCS是 "A" (或 D或C),返回1
给出 "ABCD" 和 "EACB",这个LCS是"AC"返回 2
注意
说明
REF:
最长公共子序列的定义:
- 最长公共子序列问题是在一组序列(通常2个)中找到最长公共子序列(注意:不同于子串,LCS不需要是连续的子串)。该问题是典型的计算机科学问题,是文件差异比较程序的基础,在生物信息学中也有所应用。
- https://en.wikipedia.org/wiki/Longest_common_subsequence_problem
public class Solution { /** * @param A, B: Two strings. * @return: The length of longest common subsequence of A and B. */ public int longestCommonSubsequence(String A, String B) { int n = A.length(); int m = B.length(); int f[][] = new int[n + 1][m + 1]; for(int i = 0; i < n; i++){ for(int j = 0; j < m; j++){ f[i + 1][j + 1] = Math.max(f[i][j + 1], f[i + 1][j]); if(A.charAt(i) == B.charAt(j)) f[i + 1][j + 1] = f[i][j] + 1; } } return f[n][m]; }}
REF:
http://blog.csdn.net/yysdsyl/article/details/4226630
http://www.cnblogs.com/huangxincheng/archive/2012/11/11/2764625.html
http://www.cnblogs.com/xudong-bupt/archive/2013/03/15/2959039.html
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