diff --git a/test b/test
new file mode 100644
index 0000000..c0f9289
--- /dev/null
+++ b/test
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+int ans[11];
+void f(char str[], int l0, int l) {
+    if (l0 == l) {
+        for (int i = 1; i <= ans[0]; i++) {
+            printf("%c", str[ans[i]]);
+        }
+        printf("\n");
+        return;
+    }
+    for (int i = 0; i < l0; i++) {
+        int flag = 1;
+        for (int j = 1; j <= ans[0]; j++) {
+            if (i == ans[j]) {
+                flag = 0;
+                break;
+            }
+        }
+        if (flag == 1) {
+            ans[++ans[0]] = i;
+            f(str, l0, l + 1);
+            ans[0]--;
+        }
+    }
+}
+void Cal(char* str)
+{
+    int len = strlen(str);
+    for (int i = 0; i < len - 1; i++) {
+        for (int j = 0; j < len - 1 - i; j++) {
+            int tmp;
+            if (str[j] > str[j + 1]) {
+                tmp = str[j];
+                str[j] = str[j + 1];
+                str[j + 1] = tmp;
+            }
+        }
+    }
+    f(str, len, 0);
+}
\ No newline at end of file