The availability of a system depends on how its components are connected. In a series topology, every component must be available for the system to work. In a parallel topology, the components are redundant, so the system works while at least one component remains available.
Design an AvailabilityCalculator class:
AvailabilityCalculator() creates a stateless calculator.double calculate(double[] uptimes, String mode) returns the combined availability for all components, rounded to 5 decimal places.
Each value in uptimes is an independent component's availability as a fraction from 0 to 1:
- When
mode is "series", return the product of all component uptimes. - When
mode is "parallel", multiply the component failure probabilities, (1 - uptime), and return 1 minus that product.
Do not round intermediate products. Round only the final combined availability.
Example 1:
Input:
Output:
Explanation: All three components must be available. Their combined availability is 0.99 × 0.99 × 0.99 = 0.970299, which rounds to 0.9703.
Example 2:
Input:
Output:
Explanation: Each component fails with probability 0.01. Both fail together with probability 0.01 × 0.01 = 0.0001, so the redundant pair is available with probability 1 - 0.0001 = 0.9999.
Constraints
1 <= uptimes.length <= 1000 <= uptimes[i] <= 1mode is either "series" or "parallel".- Component availability events are independent.
- At most
100 calls are made to calculate. - Answers are accepted within
10^-5 of the expected result.
Calculate System Availabilityeasy