My clear and easy DP solution defeats 81.63%

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    class Solution {
        int numDistinct(string s, string t) {
            int len=t.size();
            int dp[len]={};//dp[i]means the number of subsequence of the substring in t from 0-i
            for(int i=0;i<s.size();i++){
                for(int j=t.size()-1;j>=0;j--){//because the left value may affect the right value,so go from right to left
                        if(j>0) dp[j]+=dp[j-1];
                        else dp[j]+=1;
            return dp[len-1];

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