76 Minimum Window Substring
my solution ```python def minWindow(self, s: str, t: str) -> str: req = collections.Counter(t) wnd = collections.defaultdict(int) ...
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621 Task Scheduler
problem definition
424 Longest Repeating Character Replacement
my solution ```python def characterReplacement(self, s: str, k: int) -> int: if not s: return 0
406 Queue Reconstruction by Height
problem definition people[i] = 11(hi, ki) where hi is height of ith person ki is number of people in front ith person
134 Gas Station
problem definition