Example 1:

Input: s = "abcabcbb"
Output: 3
Explanation: The answer is "abc", with the length of 3.

Example 2:

Input: s = "bbbbb"
Output: 1
Explanation: The answer is "b", with the length of 1.

Example 3:

Input: s = "pwwkew"
Output: 3
Explanation: The answer is "wke", with the length of 3.
Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.

Constraints:

0 <= s.length <= 5 \* 104 s consists of English letters, digits, symbols and spaces.

var maxProfit = function (prices) {
  let maxP = 0;

  let l = 0;
  let r = 1;

  while (r < prices.length) {
    maxP = Math.max(maxP, prices[r] - prices[l]);

    if (prices[r] < prices[l]) {
      l = r;
    }
    r++;
  }

  return maxP;
};