const std = @import("std");

pub fn lcm(a: anytype, b: anytype) @TypeOf(a, b) {
    // Behavior from C++ and Python
    // If an argument is zero, then the returned value is 0.
    if (a == 0 or b == 0) return 0;
    return @abs(b) * (@abs(a) / std.math.gcd(@abs(a), @abs(b)));
}

test lcm {
    const expectEqual = std.testing.expectEqual;

    try expectEqual(lcm(0, 0), 0);
    try expectEqual(lcm(1, 0), 0);
    try expectEqual(lcm(-1, 0), 0);
    try expectEqual(lcm(0, 1), 0);
    try expectEqual(lcm(0, 1), 0);
    try expectEqual(lcm(7, 1), 7);
    try expectEqual(lcm(7, -1), 7);
    try expectEqual(lcm(-23, 15), 345);
    try expectEqual(lcm(120, 84), 840);
    try expectEqual(lcm(84, -120), 840);
}