115 Distinct Subsequences

LittleLiByte 發布于2019-08-14 17:59 / 824人閱讀

摘要：截取和出來填表。這里沒有新路徑產生，就是最大可能的值。

Given a string S and a string T, count the number of distinct subsequences of T in S.

A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (ie, "ACE" is a subsequence of "ABCDE" while "AEC" is not).

Here is an example:
S = "rabbbit", T = "rabbit"

Return 3.

截取"bbb" 和 "bb" 出來填表。    
  0 b b
0 1 0 0
b 1 1 0
b 1 2 1
b 1 3 3

public class Solution {
    public int numDistinct(String s, String t) {
        int[][] table = new int[s.length() + 1][t.length() + 1];
        
        for(int i=0;i

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