1//! Least common multiple (https://mathworld.wolfram.com/LeastCommonMultiple.html)
 2const std = @import("std");
 3
 4/// Returns the least common multiple (LCM) of two integers (`a` and `b`).
 5/// For example, the LCM of `8` and `12` is `24`, that is, `lcm(8, 12) == 24`.
 6/// If any of the arguments is zero, then the returned value is 0.
 7pub fn lcm(a: anytype, b: anytype) @TypeOf(a, b) {
 8    // Behavior from C++ and Python
 9    // If an argument is zero, then the returned value is 0.
10    if (a == 0 or b == 0) return 0;
11    return @abs(b) * (@abs(a) / std.math.gcd(@abs(a), @abs(b)));
12}
13
14test lcm {
15    const expectEqual = std.testing.expectEqual;
16
17    try expectEqual(lcm(0, 0), 0);
18    try expectEqual(lcm(1, 0), 0);
19    try expectEqual(lcm(-1, 0), 0);
20    try expectEqual(lcm(0, 1), 0);
21    try expectEqual(lcm(0, -1), 0);
22    try expectEqual(lcm(7, 1), 7);
23    try expectEqual(lcm(7, -1), 7);
24    try expectEqual(lcm(8, 12), 24);
25    try expectEqual(lcm(-23, 15), 345);
26    try expectEqual(lcm(120, 84), 840);
27    try expectEqual(lcm(84, -120), 840);
28    try expectEqual(lcm(1216342683557601535506311712, 436522681849110124616458784), 16592536571065866494401400422922201534178938447014944);
29}