583. Delete Operation for Two Strings

class Solution {
    public int minDistance(String word1, String word2) {
        int length = helper(word1,word2);
        return word1.length() + word2.length() - 2 * length ;
    }
    
    public int lcs(String text1, String text2) {
        int[][] dp = new int[text1.length()+1][text2.length()+1];
        for(int i=0;i<=text1.length();i++){
            for(int j=0;j<=text2.length();j++){
                if(i==0 || j==0){
                    continue;
                }
                
                if(text1.charAt(i-1)==text2.charAt(j-1)){
                    dp[i][j] = 1 + dp[i-1][j-1];
                }
                else{
                    dp[i][j] = Math.max(dp[i-1][j],dp[i][j-1]);
                }
            }
        }
        return dp[text1.length()][text2.length()];
    }
}

class Solution {
    public int minDistance(String text1, String text2) {
        int[][] dp = new int[text1.length()+1][text2.length()+1];
        for(int i=0;i<=text1.length();i++){
            for(int j=0;j<=text2.length();j++){
                if(i==0 || j==0){
                    dp[i][j] = i+j;
                }
                
                else if(text1.charAt(i-1)==text2.charAt(j-1)){
                    dp[i][j] = dp[i-1][j-1];
                }
                else{
                    dp[i][j] = 1 + Math.min(dp[i-1][j],dp[i][j-1]);
                }
            }
        }
        return dp[text1.length()][text2.length()];
    }
}