Skip to content

1287. Element Appearing More Than 25% In Sorted Array 👍

  • Time:
  • Space: $O(1)$
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
class Solution {
 public:
  int findSpecialInteger(vector<int>& arr) {
    const int n = arr.size();
    const int quarter = n / 4;

    for (int i = 0; i < n - quarter; ++i)
      if (arr[i] == arr[i + quarter])
        return arr[i];

    throw;
  }
};

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
class Solution {
  public int findSpecialInteger(int[] arr) {
    final int n = arr.length;
    final int quarter = n / 4;

    for (int i = 0; i < n - quarter; ++i)
      if (arr[i] == arr[i + quarter])
        return arr[i];

    throw new IllegalArgumentException();
  }
}

1
2
3
4
5
6
7
8
class Solution:
  def findSpecialInteger(self, arr: List[int]) -> int:
    n = len(arr)
    quarter = n // 4

    for i in range(n - quarter):
      if arr[i] == arr[i + quarter]:
        return arr[i]