use find to get the 1 and count 0s to that position

main.cpp

@@ -22,7 +22,6 @@ void printlm(T m){
 int prompti(string,bool*);
 int prompti(string,bool*);
 string prompts(string,bool*);
-bool num0b1(int);
 
 int main() {
   printlm("Get the number of 0s before 1 from:");
@@ -35,7 +34,8 @@ int main() {
     }
   } while (s);
   printm("Number of 0s before 1: ");
-  printlm(count_if(lst.cbegin(),lst.cend(), num0b1));
+  const auto the1 = find(lst.cbegin(),lst.cend(),1);
+  printlm(count(lst.cbegin(),the1, 0));
   return 0;
 }
 
@@ -77,13 +77,3 @@ string prompts(string message, bool *status) {
   *status = true;
   return tr;
 }
-
-bool num0b1(int x) {
-  static bool has1 {};
-  if (x == 1) has1 = true;
-  if (has1 || x != 0) {
-    return false;
-  } else {
-    return true;
-  }
-}