1 files changed, 5 insertions, 1 deletions

diff --git a/src/utils.c b/src/utils.c
index f72a00e..1c829c4 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -159,12 +159,16 @@ is_perm(int *a, int n)
 {
         int *aux = malloc(n * sizeof(int));
         int i;
-        
+
         for (i = 0; i < n; i++)
+                aux[i] = 0;
+        
+        for (i = 0; i < n; i++) {
                 if (a[i] < 0 || a[i] >= n)
                         return false;
                 else
                         aux[a[i]] = 1;
+        }
 
         for (i = 0; i < n; i++)
                 if (!aux[i])