diff --git a/20240906/bitset.cpp b/20240906/bitset.cpp
index 1bc2921..1d44046 100644
--- a/20240906/bitset.cpp
+++ b/20240906/bitset.cpp
@@ -1,10 +1,8 @@
 #include <any>
 #include <array>
-#include <climits>
 #include <cstddef>
 #include <iostream>
 #include <ostream>
-#include <string>
 #include <vector>
 using namespace std;
 
@@ -13,24 +11,6 @@ typedef int i8;
 
 const u8 MAX = 1e5+1;
 
-template<typename T>
-struct std::formatter<std::vector<T>> {
-    constexpr auto parse(format_parse_context& ctx)const {
-        return ctx.begin();
-    }
-
-    constexpr auto format(const std::vector<T>& v, auto& ctx)const {
-        auto out = ctx.out();
-        std::format_to(out, "[");
-        for (size_t i = 0; i < v.size(); ++i) {
-            if (i > 0) {
-                std::format_to(out, ", ");
-            }
-            std::format_to(out, "{}", v[i]);
-        }
-        return std::format_to(out, "]");
-    }
-};
 
 constexpr std::array<u8, (size_t)MAX> initLog2() {
     std::array<u8, (size_t)MAX> log2{};