551, Student Attendance Record I

Problem

leetcode 바로가기

You are given a string s representing an attendance record for a student where each character signifies whether the student was absent, late, or present on that day. The record only contains the following three characters:

• 'A': Absent.
• 'L': Late.
• 'P': Present.

The student is eligible for an attendance award if they meet both of the following criteria:

• The student was absent ('A') for strictly fewer than 2 days total.
• The student was never late ('L') for 3 or more consecutive days.

Return true if the student is eligible for an attendance award, or false otherwise.

Example 1:

Input: s = "PPALLP"
Output: true
Explanation: The student has fewer than 2 absences and was never late 3 or more consecutive days.

Example 2:

Input: s = "PPALLL"
Output: false
Explanation: The student was late 3 consecutive days in the last 3 days, so is not eligible for the award.

Constraints:

• 1 <= s.length <= 1000
• s[i] is either 'A', 'L', or 'P'.

Solution

/**
 * @param {string} s
 * @return {boolean}
 */
var checkRecord = function(s) {
    if (s.length < 2) {
        return true;
    }
  let num = [0];

  for (let i = 0; i < s.length; i++) {
    if(s[i] == "A") {
      num++;
      if (num == 2) {
        return false;
      }
    } else if (s[i - 2] == "L" && s[i - 1] == "L" && s[i] == "L") {
      return false;
    }
  }

  return true;
};