Q60 Minimum Insertion Steps to Make a String Palindrome - LeetCode 1316

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Sun Apr 02 2023 07:13:07 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public int minInsertions(String s) {
        /* Q60 of dp playlist , find longest pallindromic subsequnce 
        then minimum insertion to make strings pallindromic becomes
                    str.length() - LPS;
        */

        //code of LPS
        int n = s.length();
        int[][] dp = new int[n][n];

        for(int gap = 0 ; gap < n ; gap++){
            for(int i = 0 , j = gap ; j < n ; j++,i++){

                if(gap == 0)
                dp[i][j] = 1;

                else if(gap == 1)
                dp[i][j] = s.charAt(i)==s.charAt(j) ? 2 :1;

                else{
                    char ch1 = s.charAt(i) , ch2 = s.charAt(j);

                    if(ch1 == ch2)
                    dp[i][j] = dp[i+1][j-1] + 2;

                    else
                    dp[i][j] = Math.max(dp[i][j-1] , dp[i+1][j]);
                }
            }
        }

        //minimum insertions becomes
        return s.length() - dp[0][n-1];

    }
}

https://leetcode.com/problems/minimum-insertion-steps-to-make-a-string-palindrome/

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DP level 2

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