'javascript'에 해당되는 글 1건

  1. 2019.08.29 Is Unique?
JavaScript2019.08.29 20:03

Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structures?

 


var allUniqueChars = function(string) {
  
  
  // O(n^2) approach, no additional data structures used
  // for each character, check remaining characters for duplicates
  for (var i = 0; i < string.length; i++) {
    for (var j = i + 1; j < string.length; j++) {
      if (string[i] === string[j]) {
        return false; // if match, return false
      }
    }
  }
  return true; // if no match, return true
};

/* TESTS */
// log some tests here

console.log(allUniqueChars("abcd")); // true
console.log(allUniqueChars("aabbcd")); // false

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