01. Hackerrank vector

#include <bits/stdc++.h>

#include <algorithm>    // std::count

#include <vector>       // std::vector

using namespace std;

string ltrim(const string & );
string rtrim(const string & );

/*
 * Complete the 'findNumber' function below.
 *
 * The function is expected to return a STRING.
 * The function accepts following parameters:
 *  1. INTEGER_ARRAY arr
 *  2. INTEGER k
 */

string findNumber(vector < int > arr, int k) {

  if (std::find(arr.begin(), arr.end(), k) != arr.end()) {
    cout << "YES " << endl;

  } else {
    cout << "NO " << endl;

  }

}

int main() {
  vector < int > inputArr;
  int n = 0;
  cin >> n;
  // n--;
  cin.ignore();
  while (n--) {
    int x;
    cin >> x;
    inputArr.push_back(x);

  }
  int k;
  cin >> k;
  findNumber(inputArr, k);
  return 0;
}

string ltrim(const string & str) {
  string s(str);

  s.erase(
    s.begin(),
    find_if(s.begin(), s.end(), not1(ptr_fun < int, int > (isspace)))
  );

  return s;
}

string rtrim(const string & str) {
  string s(str);

  s.erase(
    find_if(s.rbegin(), s.rend(), not1(ptr_fun < int, int > (isspace))).base(),
    s.end()
  );

  return s;
}