1 files changed, 17 insertions, 18 deletions

diff --git a/2024/src/day02.cpp b/2024/src/day02.cpp
index c8ca66f..e3597a3 100644
--- a/2024/src/day02.cpp
+++ b/2024/src/day02.cpp
@@ -1,4 +1,3 @@
-#include <cstddef>
 #include <fstream>
 #include <iostream>
 #include <sstream>
@@ -12,11 +11,11 @@ read_file(string_view filename)
         fstream              input{ filename };
         vector<vector<long>> lines;
 
-        auto split = [](const string& str) {
-                stringstream sstr{ str };
+        auto split = [](const string& line) {
+                stringstream line_stream{ line };
                 vector<long> values;
 
-                for ( long value = 0; sstr >> value; ) {
+                for ( long value = 0; line_stream >> value; ) {
                         values.emplace_back(value);
                 }
                 return values;
@@ -25,7 +24,6 @@ read_file(string_view filename)
         for ( string line; getline(input, line); ) {
                 lines.emplace_back(split(line));
         }
-
         return lines;
 }
 
@@ -43,6 +41,19 @@ is_safe(const vector<long>& values)
         return all_positive || all_negative;
 }
 
+bool
+is_real_safe(const vector<long>& values)
+{
+        for ( size_t i = 0; i != values.size(); ++i ) {
+                auto values_copy = values;
+                values_copy.erase(values_copy.begin() + ptrdiff_t(i));
+                if ( is_safe(values_copy) ) {
+                        return true;
+                }
+        }
+        return false;
+}
+
 void
 part1(const vector<vector<long>>& lines)
 {
@@ -52,19 +63,7 @@ part1(const vector<vector<long>>& lines)
 void
 part2(const vector<vector<long>>& lines)
 {
-        long safe_count = 0;
-        for ( const auto& line: lines ) {
-                auto         safe = false;
-                for ( size_t i = 0; i != line.size(); ++i ) {
-                        auto copy = line;
-                        copy.erase(copy.begin() + ptrdiff_t(i));
-                        safe |= is_safe(copy);
-                }
-                if ( safe ) {
-                        ++safe_count;
-                }
-        }
-        cout << safe_count << endl;
+        cout << ranges::count_if(lines, is_real_safe) << endl;
 }
 
 int