GFG_problem_of_the_day/134.transform_strings.cpp at main · Dharm3438/GFG_problem_of_the_day · GitHub

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// Transform String

// { Driver Code Starts
#include <bits/stdc++.h>
#include <unordered_map>
using namespace std;


 // } Driver Code Ends


class Solution
{
    public:
    int transform (string A, string B)
    {
        //code here.
        if(A.size()!=B.size())
        {
            return -1;
        }
        int s=A.size();
        int s1=0, s2=0;
        for(int i=0; i<s;i++ )
        {
            s1+=int(A[i]);
            s2+=int(B[i]);
        }
        if(s1!=s2)
        return -1;
        int i=s, j=s, cnt=0;
        while(i>=0 && j>=0)
        {
            if(A[i]==B[j])
            {
                i--;
                j--;
            }
            else
            {
                i--;
                cnt++;
            }
        }
        return cnt;
    }
};


// { Driver Code Starts.

int main ()
{
    int t; cin >> t;
    while (t--)
    {
        string A, B;
        cin >> A >> B;
        Solution ob;
        cout <<ob.transform (A, B) << endl;
    }
}  // } Driver Code Ends