string

13 problems with this tag

	Problem	Difficulty
	Backspace String Compare	easy
	Check if All Characters Have Equal Number of Occurrences	easy
	Check If Sentence Is Pangram	easy
	First Letter to Appear Twice	easy
	Group Anagrams	medium
	Jewels and Stones	easy
	Longest Substring With At Most K Distinct Characters	medium
	Longest Substring Without Repeating Characters	medium
	Maximum Number of Balloons	easy
	Ransom Note	easy
	Remove All Adjacent Duplicates In String	easy
	Simplify Path	medium
	Valid Parentheses	easy