diff --git a/build&run.sh b/build&run.sh
index 912b010..1a0521d 100755
--- a/build&run.sh
+++ b/build&run.sh
@@ -1,4 +1,5 @@
 #! /bin/sh
+rm -rf build
 mkdir build
 cmake -DCMAKE_BUILD_TYPE=Debug -B build
 cmake --build build --parallel