diff --git a/src/P8093/P8093.cpp b/src/P8093/P8093.cpp
index 37ded02..ef2f534 100755
--- a/src/P8093/P8093.cpp
+++ b/src/P8093/P8093.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <exception>
+#include <algorithm>
 
 using ull = unsigned long long;
 
@@ -24,12 +25,11 @@ ull cal(ull a,ull b){
         if(a&1)return cal(a+1,b)+1;
         else return cal(a/2,b)+1;
     }else if(a>b/2){
-        if(a*2-b<b-a){
-            if(b&1)return cal(a,b-1)+1;
-            else return cal(a,b/2)+1;
-        }else return b-a;
+        const auto ans = b-a;
+        if(b&1)return std::min(ans,cal(a,b-1)+1);
+        else return std::min(ans,cal(a,b/2)+1);
     }else if(a<=b/2){
-        if(b&1)return cal(a,b+1)+1;
+        if(b&1)return cal(a,b-1)+1;
         else return cal(a,b/2)+1;
     }
     throw std::runtime_error("cannot calculate");