#3330 - Find the Original Typed String I

Easy • View on LeetCode • View on GitHub

Problem Description

Alice is attempting to type a specific string on her computer. However, she tends to be clumsy and may press a key for too long, resulting in a character being typed multiple times.

Although Alice tried to focus on her typing, she is aware that she may still have done this at most once.

You are given a string word, which represents the final output displayed on Alice's screen.

Return the total number of possible original strings that Alice might have intended to type.

Solution

/**
 * @param {string} word
 * @return {number}
 */
var possibleStringCount = function(word) {
  let result = 1;
  let consecutiveCount = 1;

  for (let i = 1; i < word.length; i++) {
    if (word[i] === word[i - 1]) {
      consecutiveCount++;
    } else {
      if (consecutiveCount > 1) {
        result += consecutiveCount - 1;
      }
      consecutiveCount = 1;
    }
  }

  if (consecutiveCount > 1) {
    result += consecutiveCount - 1;
  }

  return result;
};