C++ Program for Union of Two Arrays.Given two sorted arrays, find their union and intersection.
C++ Program for Union of Two Arrays
#include<iostream>
using namespace std;
int main()
{
int a1[20],a2[20],u[40],i,j,k,n,m;
cout<<"Enter size of first array:";
cin>>n;
cout<<"Enter elements of first array in ascending order:\n";
for(i=0;i<n;++i){
cin>>a1[i];
}
cout<<"\nEnter size of second array:";
cin>>m;
cout<<"Enter elements of second array in ascending order:\n";
for(i=0;i<m;++i){
cin>>a2[i];
}
for(i=0,j=0,k=0;i<n&&j<m;){
if(a1[i]<a2[j]){
u[k]=a1[i];
i++;
k++;
}
else if(a1[i]>a2[j]){
u[k]=a2[j];
j++;
k++;
}
else{
u[k]=a1[i];
i++;
j++;
k++;
}
}
if(i<n){
for(;i<n;++i){
u[k]=a1[i];
k++;
}
}
else if(j<m){
for(;j<m;++j){
u[k]=a2[j];
k++;
}
}
cout<<"\nUnion of two arrays is:\n";
for(i=0;i<k;++i){
cout<<u[i]<<" ";
}
return 0;
}Output of Program
Enter size of first array:5
Enter elements of first array in ascending order:
4
4
4
7
9
Enter size of second array:4
Enter elements of second array in ascending order:
7
58
98
5
Union of two arrays is:
4 4 4 7 9 58 98 5