Implement a rate limiter that upon construction is given an integer representing the number of times a target resource is accessible during a fixed 1-minute time window. The interface would declare a single method: boolean canAccess() that would return true if a resource can be accessed immediately during the current time window, false otherwise. Additional requirements: * You can't use any helper thread to maintain state. * Must maintain time complexity of O(1) * Must be thread safe.
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