1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*local function gcd(a,b)
if b == 0 then return a end
return gcd(b, math.fmod(a, b))
end
local function lcm(a)
local out = a[1]
for i=2,#a do
out = ((a[i] * out)) / (gcd(a[i], out))
end
return out
end
*/
#include "math.h"
#include "stdint.h"
#include <stdlib.h>
uint64_t gcd(uint64_t a, uint64_t b){
if(b == 0) return a;
return gcd(b, a % b);
}
uint64_t lcm(uint64_t* a, size_t len){
uint64_t out = a[0];
for(size_t i = 1; i != len; i++){
out = (a[i] * out) / gcd(a[i], out);
}
return out;
}
int l_lcm(lua_State* L){
luaL_checktype(L, 1, LUA_TTABLE);
size_t len = lua_objlen(L,1);
uint64_t* nums = malloc(sizeof * nums * len);
for(size_t i = 0; i <= len-1; i++){
lua_pushinteger(L,i+1);
lua_gettable(L,1);
nums[i] = luaL_checknumber(L, -1);
lua_pop(L,1);
}
lua_pushnumber(L, lcm(nums, len));
free(nums);
return 1;
}
|
