Find unique numbers in array - c++

Question

Well, I have to find how many different numbers are in an array.
For example if array is: 1 9 4 5 8 3 1 3 5
The output should be 6, because 1,9,4,5,8,3 are unique and 1,3,5 are repeating (not unique).
So, here is my code so far..... not working properly thought.
#include <iostream>
using namespace std;
int main() {
int r = 0, a[50], n;
cin >> n;
for (int i = 0; i < n; i++) {
cin >> a[i];
}
for (int j = 0; j < n; j++) {
for (int k = 0; k < j; k++) {
if (a[k] != a[j]) r++;
}
}
cout << r << endl;
return 0;
}

Answer 1

Let me join the party ;)
You could also use a hash-table:
#include <unordered_set>
#include <iostream>
int main() {
int a[] = { 1, 9, 4, 5, 8, 3, 1, 3, 5 };
const size_t len = sizeof(a) / sizeof(a[0]);
std::unordered_set<int> s(a, a + len);
std::cout << s.size() << std::endl;
return EXIT_SUCCESS;
}
Not that it matters here, but this will likely have the best performance for large arrays.
If the difference between smallest and greatest element is reasonably small, then you could do something even faster:
Create a vector<bool> that spans the range between min and max element (if you knew the array elements at compile-time, I'd suggest the std::bitset instead, but then you could just compute everything in the compile-time using template meta-programming anyway).
For each element of the input array, set the corresponding flag in vector<bool>.
Once you are done, simply count the number of trues in the vector<bool>.

Answer 2

A std::set contains only unique elements already.
#include <set>
int main()
{
int a[] = { 1, 9, 4, 5, 8, 3, 1, 3, 5 };
std::set<int> sa(a, a + 9);
std::cout << sa.size() << std::endl;
}

Answer 3

How about this?
#include <list>
int main()
{
int a[] = {1, 9, 4, 5, 8, 3, 1, 3, 5};
std::list<int> la(a, a+9);
la.sort();
la.unique();
std::cout << la.size() << std::endl;
return 0;
}

Answer 4

Since you've stated that you cannot use the standard library and must use loops, let's try this solution instead.
#include <iostream>
using namespace std; // you're a bad, bad boy!
int main()
{
int r = 0, a[50], n;
cout << "How many numbers will you input? ";
cin >> n;
if(n <= 0)
{
cout << "What? Put me in Coach. I'm ready! I can do this!" << endl;
return -1;
}
if(n > 50)
{
cout << "So many numbers! I... can't do this Coach!" << endl;
return -1;
}
cout << "OK... Enter your numbers now." << endl;
for (int i = 0; i < n; i++)
cin >> a[i];
cout << "Let's see... ";
// We could sort the list but that's a bit too much. We will choose the
// naive approach which is O(n^2), but that's OK. We're still learning!
for (int i = 0; i != n; i++)
{ // Go through the list once.
for (int j = 0; j != i; j++)
{ // And check if this number has already appeared in the list:
if((i != j) && (a[j] == a[i]))
{ // A duplicate number!
r++;
break;
}
}
}
cout << "I count " << n - r << " unique numbers!" << endl;
return 0;
}
I urge you to not submit this code as your homework - at least not without understanding it. You will only do yourself a disservice, and chances are that your instructor will know that you didn't write it anyways: I've been a grader before, and it's fairly obvious when someone's code quality magically improves.

Answer 5

I think the location for increasing the value of r is incorrect
#include <iostream>
using namespace std;
int main()
{
int r=0,a[50],n;
cin >>n;
for(int i=0;i<n;i++)
{
cin >> a[i];
}
for (int j=0;j<n;j++)
{
bool flag = true;
for(int k=;k<j;k++)
{
if(a[k]!=a[j])
{
flag = false;
break;
}
}
if (true == flag)
{
r++;
}
}
cout << r << endl;
return 0;
}
However, my suggestion is using more sophisticated algorithms (this algorithm has O(N^2)).

Answer 6

this should work, however its probably not the optimum solution.
#include <iostream>
using namespace std;
int main()
{
int a[50],n;
int uniqueNumbers; // this will be the total numbers entered and we will -- it
cin >>n;
uniqueNumbers = n;
for(int i=0;i<n;i++)
{
cin >> a[i];
}
for (int j=0;j<n;j++)
{
for(int k=0;k<n;k++)
{
/*
the and clause below is what I think you were missing.
you were probably getting false positatives when j == k because a[1] will always == a[1] ;-)
*/
if((a[k] == a[j]) && (k!=j))
{ uniqueNumebers--; }
}
}
cout << uniqueNumbers << endl;
return 0;
}

Answer 7

We can use C++ STL vector in this program .
int main()
{
int a[] = {1, 9, 4, 5, 8, 3, 1, 3, 5};
vector<int>v(a, a+9);
sort(v.begin(), v.end());
v.erase(unique(v.begin(), v.end()), v.end());
cout<<v.size()<<endl;
return 0;
}

Answer 8

Please dry run your code
See in the outer for loop for each element it is counted more than one inside inner loop.let us say the loop contains 1,2,3,4.1.....elements dry run it in the second iteration and third iteration 1 is counted because 1 is 1!=2 as well as 1!=3
Now solution time!!
#include<iostream>
#include<vector>
#include<algorithm>
#define ll long long
using namespace std;
ll arr[1000007]={0};
int main()
{
ios_base::sync_with_stdio(false);//used for fast i/o
ll n;cin>>n;
for(ll i=1;i<=n;i++)
cin>>arr[i];
sort(arr,arr+n);
ll cnt=0;
for(ll i=1;i<=n-1;i++)
{
if(arr[i+1]-arr[i]==0)
cnt++;
}
cout<<n-cnt<<endl;
cin.tie(NULL);
return 0;
}

Answer 9

#include<bits/stdc++.h>
using namespace std;
int find_unique(int arr[], int size){
int ans = 0;
for(int i = 0; i < size; i++){
ans = ans^arr[i]; // this is bitwise operator .its call XOR it's return only unique value..
}
return ans;
}
void print_array(int arr[], int size){
for(int i = 0; i < size; i++){
cout << arr[i] << " ";
}
cout << endl;
}
int main()
{
ios_base::sync_with_stdio(false); cin.tie(NULL); // use for fast input and output....
int arr[5] = {1, 3, 5, 3, 1};
cout <<"Orginal array: " << endl;
print_array(arr, 5);
int result = find_unique(arr, 5);
cout << result << endl;
return 0;
}