memory access violation

[123TzTz321]

https://github.com/NumericalMax/Linear-Regression/blob/master/main.cpp#L109
a is lxl but https://github.com/NumericalMax/Linear-Regression/blob/master/main.cpp#L118 would point beyond

diff --git a/main.cpp b/main.cpp
index 4e306d1..7a23a44 100644
--- a/main.cpp
+++ b/main.cpp
@@ -106,7 +106,7 @@ namespace matrixOperation{
         float t;
         float **a = new float*[l];
         for(int i = 0; i < l; ++i){
-            a[i] = new float[l];
+            a[i] = new float[2*l];
         }
         for(i=0;i<l;i++){
             for(j=0;j<l;j++){