1237 - Find Positive Integer Solution for a Given Equation.

Medium

Given a callable function f(x, y) with a hidden formula and a value z, reverse engineer the formula and return all positive integer pairs x and y where f(x,y) == z. You may return the pairs in any order.

While the exact formula is hidden, the function is monotonically increasing, i.e.:

• f(x, y) < f(x + 1, y)

• f(x, y) < f(x, y + 1)

The function interface is defined like this:

interface CustomFunction { public: // Returns some positive integer f(x, y) for two positive integers x and y based on a formula. int f(int x, int y); };

We will judge your solution as follows:

• The judge has a list of 9 hidden implementations of CustomFunction, along with a way to generate an answer key of all valid pairs for a specific z.

• The judge will receive two inputs: a function_id (to determine which implementation to test your code with), and the target z.

• The judge will call your findSolution and compare your results with the answer key.

• If your results match the answer key , your solution will be `