make sure your types can fit your values

your rounding error probably comes from involving f64, python:

>>> int(float(9**19))
1350851717672992000

likewise, make sure you use a large enough integer type - for example, 1350851717672992000 barely fits in a 64-bit int but not in a 32-bit int, and if you were to go a bit bigger than that you would overflow the 64-bit int as well

Have you resolved it? I have the same problem

I'm stuck on this with Swift. My code passes all tests except for very large numbers apparently:

Full Tests
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 35875699062250035
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 4498128791164624869
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 4929273885928088826
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 21897142587612075
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 1517841543307505039
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 35641594208964132
XCTAssertEqual failed: ("true") is not equal to ("false") - Should return true for 3289582984443187032

When I logged my output I saw that I have rounding errors, for example:
9 ^ 19 = 1350851717672992089

But Swift returns 1350851717672992000

Has anyone had the same problem? Any tips?