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Count the triplets .cpp
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Count the triplets .cpp
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// { Driver Code Starts
#include <bits/stdc++.h>
using namespace std;
// } Driver Code Ends
//User function template for C++
class Solution{
public:
int countTriplet(int A[], int n)
{
unordered_map<int,int> m ;
int count = 0;
for(int i = 0; i < n ; i ++ )
{
m[A[i]]++;
}
for(int i = 0; i < n ; i ++ )
{
for(int j = i+1; j < n; j++)
{
//cout<<A[i] +A[j] <<" ";
if( m.find(A[i] + A[j]) != m.end())
{
//cout<<A[i] + A[j]<<endl;
count++;
}
}
}
return count;
}
};
// { Driver Code Starts.
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
int t;
cin >> t;
while (t--)
{
int n;
cin >> n;
int arr[n];
for(int i = 0; i < n; i++)
cin >> arr[i];
Solution ob;
cout << ob.countTriplet(arr, n) << "\n";
}
return 0;
} // } Driver Code Ends