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  1. Prepare
  2. Algorithms
  3. Implementation
  4. Beautiful Triplets
  5. Discussions

Beautiful Triplets

  • alban_tyrex
     + 0 comments

    Here is my O(n) c++ solution, you can watch the implementation here : https://youtu.be/vLD3N79nLSE

    int beautifulTriplets(int d, vector<int> arr) {
    map<int, int> mp;
    int result = 0;
    for (int a : arr) {
        mp[a] += 1;
        result += mp[a-d]*mp[a-2*d];
    }
    return result;
}