Q52 Maximum difference of zeros and ones in binary string | Practice | GeeksforGeeks

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Sat Apr 01 2023 05:46:20 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

//{ Driver Code Starts
//Initial Template for Java

import java.io.*;
import java.util.*;

class GFG {
    public static void main(String args[]) throws IOException {
        BufferedReader read =
            new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(read.readLine());
        while (t-- > 0) {
            
            String s = read.readLine();
            Solution ob = new Solution();
            System.out.println(ob.maxSubstring(s));
        }
    }
}
// } Driver Code Ends


//User function Template for Java

class Solution {
    int maxSubstring(String s) {
        /* Q52 of dp playlist , making 0's to 1 and 1's to -1 and then applying
        kadane's algo to find max sum sub array which will also give use the 
        max difference between 0's and 1's
        */
        
        //applying kadanes
        int csum = 0 , omax = Integer.MIN_VALUE;
        
        for(int i =0 ; i < s.length() ; i++){
            char ch = s.charAt(i);
            int val = 0;
            
            if(ch == '0')
            val = 1;
            
            else
            val = -1;
            
            if(csum > 0)
            csum += val;
            
            else
            csum = val;
            
            omax = Math.max(csum , omax);
        }
        return omax;
    }
}

https://practice.geeksforgeeks.org/problems/maximum-difference-of-zeros-and-ones-in-binary-string4111/1

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DP level 2

@Ayush_dabas07

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