package Others; import java.util.Arrays; import java.util.Scanner; /** * To find triplet equals to given sum in complexity O(n*log(n)) * *
Array must be sorted * * @author Ujjawal Joshi * @date 2020.05.18 *
Test Cases: Input: 6 //Length of array 12 3 4 1 6 9 target=24 Output:3 9 12 Explanation: * There is a triplet (12, 3 and 9) present in the array whose sum is 24. */ class ThreeSum { public static void main(String args[]) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); // Length of an array int a[] = new int[n]; for (int i = 0; i < n; i++) { a[i] = sc.nextInt(); } System.out.println("Target"); int n_find = sc.nextInt(); Arrays.sort(a); // Sort the array if array is not sorted for (int i = 0; i < n; i++) { int l = i + 1, r = n - 1; while (l < r) { if (a[i] + a[l] + a[r] == n_find) { System.out.println(a[i] + " " + a[l] + " " + a[r]); break; } // if you want all the triplets write l++;r--; insted of break; else if (a[i] + a[l] + a[r] < n_find) l++; else r--; } } sc.close(); } }