initial commit

lib/random.c

@@ -0,0 +1,12 @@
+#include <random.h>
+
+const int _random_a = 100003;
+const int _random_c = 114514 + 33;
+const int _random_m = 1000000007;
+int seed = 0;
+
+int random(void)
+{
+  seed = _random_a * (seed + _random_c) % _random_m;
+  return seed;
+}