Check out example codes for "Print all the triplets having sum equal to k". It will help you in understanding the concepts better.

Code Example 1

``````// C++ program to find triplets in a given
// array whose sum is given sum.
#include <bits/stdc++.h>
using namespace std;

// Function to print triplets with given sum
void findTriplets(int arr[], int n, int sum)
{
// Sort array elements
sort(arr, arr + n);

for (int i = 0; i < n - 1; i++) {

// initialize left and right
int l = i + 1;
int r = n - 1;
int x = arr[i];
while (l < r) {
if (x + arr[l] + arr[r] == sum) {

// Print elements if it's sum is given sum.
printf("%d %d %d\n", x, arr[l], arr[r]);
l++;
r--;
}

// If sum of three elements is less
// than 'sum' then increment in left
else if (x + arr[l] + arr[r] < sum)
l++;

// if sum is greater than given sum, then
// decrement in right side
else
r--;
}
}
}

// Driver code
int main()
{
int arr[] = { 0, -1, 2, -3, 1 };
int sum = -2;
int n = sizeof(arr) / sizeof(arr[0]);
findTriplets(arr, n, sum);
return 0;
}``````

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