Array sum pairs

#1

import java.util.*;
public class Main {
public static void main (String args[]) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();

int arr[]=new int[n];
for(int i=0;i<arr.length;i++)

{
arr[i]=sc.nextInt();
}
int m=sc.nextInt();
int arr1[]=new int[m];
for (int j=0;j<arr1.length;j++)
{
arr1[j]=sc.nextInt();
}
if(n>m){
sum(arr,arr1,n,m);
}
else{
sum(arr1,arr,m,n);
}
}
public static void sum(int a[],int []b,int n,int m){
int carry=0,s=0;
int i=n-1;
int j=m-1;
int k=n-1;
int sum[]=new int[k+1];
while(j>=0){
s=a[i]+b[j]+carry;
sum[k]=s%10;
carry=s/10;
i–;
j–;
k–;

}
while(i>=0){
	s=a[i]+carry;
	sum[k]=s%10;
	carry=s/10;
}
if(carry==1){
	System.out.print(1+" ,");
}
for(int r=0;r<n;r++)
{
	System.out.print(sum[r]+",");
}
System.out.println("END");

}
}
}
}

}

}
please correct the code somewhee i went wron

#2

@karthik1989photos,
While printing add a space after sum[r] as well.

Suggested approach:

1.Traverse both the arrays simultaneously from the end until we reach the 0th index of either of the array.
2.While traversing each element of array, add an element from both arrays and carry from the previous sum.
…………2.1 Store the unit digit of the sum(obtained by doing - sum%10) in the ans array.
…………2.2 forward carry(obtained by doing - sum/10) for the next index sum.
3.After the loop ends we are left with one of the arrays and the carry.
4.We will now repeat step 2 but now for one array which is left after the loop.
5.If carry !=0 then store the carry in the 0th index of ans array.
6.Print the ans array .

#3

import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner scn=new Scanner(System.in);
int n=scn.nextInt();
int[] ar1=new int[n];
for(int i=0;i<n;i++)
ar1[i]=scn.nextInt();
int m=scn.nextInt();
int[] ar2=new int[m];
for(int i=0;i<m;i++)
ar2[i]=scn.nextInt();
int p=m>n?m+1:n+1;
int[] res=new int[p];
int i=ar1.length-1;
int j=ar2.length-1;
int k=res.length-1;
int carry=0;
while(i>=0&&j>=0)
{
if(k==1)
{
res[k]=ar1[i]+ar2[j]+carry;
}
res[k]=carry+(ar1[i]+ar2[j])%10;
carry=(ar1[i]+ar2[j])/10;
i–;
j–;
k–;
}
while(i>=0)
{
if(k==1)
{
res[k]=ar1[i];
}
res[k]=(ar1[i]%10)+carry;
carry=ar1[i]/10;
i–;
k–;
}
while(j>=0)
{
if(k==1)
{
res[k]=ar2[j];
}
res[k]=(ar2[j]%10)+carry;
carry=ar2[j]/10;
j–;
k–;
}
for(int a=0;a<res.length;a++)
{
if(a==0&&res[a]==0)
continue;
System.out.print(res[a]+", ");
}
System.out.print(“END”);
}
}

this is my modified code 2 testcases are running one went wrong.plz correct the code

#4

@karthik1989photos,
Wrong answer for the input:
2
9 9
2
9 9
Correct output:
1, 9, 8, END
Your output:
9, 8, END

Another input for which answer is wrong can be:
2
9 9
4
9 9 9 9

https://ide.codingblocks.com/s/269409 corrected code.

#5

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