I need a program in c++ the same as below code but
I want it to prompt the user to enter the number of elements
after that I want it to ask the user to enter the array elements
#include<algorithm>
#include<stdio.h>
#include<string.h>
#include<iostream>
using namespace std;
int a[50]={2,5,4,3};
bool x[100];
int N=4;//number of elements
int k=10;//target sum
int sum;//current target sum
int cmp(const void *a,const void *b)
{
return *(int *)b-*(int *)a;
}
void backtrace(int n)
{
if(sum>k)
return ;
if(sum==k)
{
for(int j=0;j<n;++j)
{
if(x[j])
cout<<a[j]<<" ";
}
cout<<endl;
return;
}
if(n==N)
return ;
for(int i=n;i<N;++i)
{
if(x[i]==false)
{
x[i]=true;
sum+=a[i];
backtrace(i+1);
x[i]=false;
sum-=a[i];
while(i<N-1 && a[i]==a[i+1])
i++;
}
}
}
int main()
{
sum=0;
memset(x,0,sizeof(x));
qsort(a,N,sizeof(a[0]),cmp);
backtrace(0);
return 0;
}
#include<algorithm>
#include<stdio.h>
#include<string.h>
#include<iostream>
using namespace std;
int a[50];
bool x[100];
int N;//number of elements
int k=10;//target sum
int sum;//current target sum
int cmp(const void *a,const void *b)
{
return *(int *)b-*(int *)a;
}
void backtrace(int n)
{
if(sum>k)
return ;
if(sum==k)
{
for(int j=0;j<n;++j)
{
if(x[j])
cout<<a[j]<<" ";
}
cout<<endl;
return;
}
if(n==N)
return ;
for(int i=n;i<N;++i)
{
if(x[i]==false)
{
x[i]=true;
sum+=a[i];
backtrace(i+1);
x[i]=false;
sum-=a[i];
while(i<N-1
&& a[i]==a[i+1])
i++;
}
}
}
int main()
{
sum=0;
cout<<"Enter no of elements: ";
cin>>::N;//::N consider variable N as
the global variable
cout<<"Enter Array Elements: ";
for(int i=0;i<N;i++){
cin>>a[i];
}
memset(x,0,sizeof(x));
qsort(a,N,sizeof(a[0]),cmp);
backtrace(0);
return 0;
}
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