Algorithms/EndSemq2.java at main · Pranita1305/Algorithms · GitHub

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import java.util.*;

public class EndSemq2 {

    public static int cost(int A[],int B[],String s1, String s2,int i,int j,int dp[][]){

        if(s1.length()==0){
            int cost=0;
            for(int ind=j;ind>=0;ind--){
                cost+=B[ind];
            }
            return cost;
        }

        if(s2.length()==0){
            int cost=0;
            for(int ind=i;ind>=0;ind--){
                cost+=A[ind];
            }
            return cost;
        }

        if(i<0){
            int num=0;
            for(int k=j;k>=0;k--){
                num=num+B[k];
            }
            return num;
        }

        if(j<0){
            int num=0;
            for(int k=i;k>=0;k--){
                num=num+A[k];
            }
            return num;
        }

        if(i==0 && j==0){
            if(s1.charAt(i)==s2.charAt(j)){
                return 0;
            }
            else{
                return A[i]+B[j];
            }
        }

        if(dp[i][j]!=-1) return dp[i][j];

        if(s1.charAt(i)==s2.charAt(j)){
            dp[i][j]=cost(A, B, s1, s2, i-1, j-1, dp);
        }
        else{
            dp[i][j]=Math.min((A[i]+cost(A, B, s1, s2, i-1, j, dp)), (B[j]+cost(A, B, s1, s2, i, j-1, dp)));
        }

        return dp[i][j];
    }

    public static void main(String[] args) {
        int Cost=0;
        int lengthA, lengthB;
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a string");
        String s1=sc.next();
        lengthA=s1.length();

        System.out.println("Enter a string");
        String s2=sc.next();
        lengthB=s2.length();

        System.out.println("Enter costArray1");
        int costA[]=new int[lengthA];
        for(int i=0;i<lengthA;i++){
            costA[i]=sc.nextInt();
        }


        if(s2=="null"){
            Cost=0;
            for(int ind=0;ind<s1.length();ind++){
                Cost+=costA[ind];
            }
        }
        else{
            System.out.println("Enter costArray2");
            int costB[]=new int[lengthB];
            for(int i=0;i<lengthB;i++){
                costB[i]=sc.nextInt();
            }

            int dp[][]=new int[lengthA][lengthB];
            for(int[] row : dp) {
                Arrays.fill(row, -1);
            }

            Cost = cost(costA, costB, s1, s2, lengthA-1, lengthB-1, dp);

            System.out.println("Cost is " + Cost);

            sc.close();
        }


    }
}