1 files changed, 20 insertions, 0 deletions
diff --git a/scraps/random.c b/scraps/random.c
new file mode 100644
index 0000000..38f6aff
--- /dev/null
+++ b/scraps/random.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+int main() {
+    size_t size = ((size_t)RAND_MAX) + 1;
+    char *randoms = calloc(size, sizeof(char));
+    int dups = 0;
+    srand(time(0));
+    for (int i = 0; i < RAND_MAX; i++) {
+        int r = rand();
+        if (randoms[r]) {
+            // printf("duplicate at %d\n", r);
+            dups++;
+        }
+        randoms[r] = 1;
+    }
+    printf("duplicates: %d\n", dups);
+}