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115_numDistinct.java

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public class Solution {

public int numDistinct(String s, String t) {

int[][] dp = new int[t.length()+1][s.length()+1];

for(int i = 0; i <= s.length(); i++){

dp[0][i] = 1;

}

for(int i = 1; i <= t.length(); i++){

for(int j = 1; j <= s.length(); j++){

if(t.charAt(i-1)!=s.charAt(j-1)){ // be careful this is i-1 and j-1

dp[i][j] = dp[i][j-1];

} else{

dp[i][j] = dp[i-1][j-1]+dp[i][j-1];

}

}

}

return dp[t.length()][s.length()];

}

}