1 files changed, 3 insertions, 3 deletions
diff --git a/stratified_sampling.cpp b/stratified_sampling.cpp
index 22bdbf5..f6c3ff1 100644
--- a/stratified_sampling.cpp
+++ b/stratified_sampling.cpp
@@ -26,9 +26,9 @@ double quantile_truncate_normal (int i, int n, double mu,
 
 std::pair<double, double> mean_var( std::vector<double> r){
     std::pair<double, double> p;
-    for(int i=0; i<r.size(); i++){
-        p.first += r[i];
-        p.second += r[i]*r[i];
+    for(auto &x: r){
+        p.first += x;
+        p.second += x*x;
     }
     p.first /= r.size();
     p.second /= r.size();