Object Pool Checkout and Checkin

Problem

Simulate an object pool with fixed capacity.

operations contains "checkout" (lend the smallest free object id, or -1 when none are free), "checkin" (values[i] is the returned object id, recording True or False), "available" (record the number of free objects), or "in_use" (record the number of lent objects).

Return the list of recorded results.

Hint

Checking in an id that is not currently lent must be rejected.

Test cases

case 1

in: [3,["checkout","checkout","checkin","checkout","available","in_use"],[0,0,0,0,0,0]]

expected: [0,1,true,0,1,2]

case 2

in: [1,["checkout","checkout","available"],[0,0,0]]

expected: [0,-1,0]

case 3

in: [2,["checkin","available"],[5,0]]

expected: [false,2]

case 4

in: [2,["checkout","checkin","checkin","available"],[0,0,0,0]]

expected: [0,true,false,2]

Starter codePython

def pool_ops(capacity, operations, values):
    # Your code here
    pass

4 test cases · run your code against them in the editor