From cd29f907d128bf0a3498469b80f54900017e29b9 Mon Sep 17 00:00:00 2001
From: Yuya Asano <64895419+sukeya@users.noreply.github.com>
Date: Fri, 8 May 2026 09:40:26 +0900
Subject: [PATCH 1/3] Fix operator*(scalar).

---
 include/mvPolynomial/mvPolynomial.hpp | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/mvPolynomial/mvPolynomial.hpp b/include/mvPolynomial/mvPolynomial.hpp
index 2c993f1..9e8bd25 100644
--- a/include/mvPolynomial/mvPolynomial.hpp
+++ b/include/mvPolynomial/mvPolynomial.hpp
@@ -371,10 +371,9 @@ class MVPolynomial final {
 
   MVPolynomial& operator*=(mapped_type r) {
     auto idx = index_type::Zero();
-    if (contains(idx)) {
-      (*this)[idx] *= r;
-    } else {
-      (*this)[idx] = r;
+    for (auto& index_and_coeff : *this) {
+      auto& coeff = index_and_coeff.second;
+      coeff *= 2;
     }
     return *this;
   }

From ed6e033f8cef408e7abb2b6fb237fcfa8a04c2bb Mon Sep 17 00:00:00 2001
From: Yuya Asano <64895419+sukeya@users.noreply.github.com>
Date: Fri, 8 May 2026 09:43:22 +0900
Subject: [PATCH 2/3] Remove operator[] const.

---
 include/mvPolynomial/mvPolynomial.hpp | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/include/mvPolynomial/mvPolynomial.hpp b/include/mvPolynomial/mvPolynomial.hpp
index 9e8bd25..9e80c8d 100644
--- a/include/mvPolynomial/mvPolynomial.hpp
+++ b/include/mvPolynomial/mvPolynomial.hpp
@@ -188,13 +188,6 @@ class MVPolynomial final {
   mapped_type& operator[](const key_type& index) { return index2value_[index]; }
   mapped_type& operator[](key_type&& index) { return index2value_[index]; }
 
-  const mapped_type& operator[](const key_type& index) const {
-    return const_cast<MVPolynomial*>(this)->operator[](index);
-  }
-  const mapped_type& operator[](key_type&& index) const {
-    return const_cast<MVPolynomial*>(this)->operator[](index);
-  }
-
   mapped_type&       at(const key_type& i) { return index2value_.at(i); }
   const mapped_type& at(const key_type& i) const { return index2value_.at(i); }
 

From bbe31b786813c4bcda32091de4cbe09a0cad31fd Mon Sep 17 00:00:00 2001
From: Yuya Asano <64895419+sukeya@users.noreply.github.com>
Date: Fri, 8 May 2026 09:48:09 +0900
Subject: [PATCH 3/3] Fix operator= to clear before assigning.

---
 include/mvPolynomial/mvPolynomial.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/mvPolynomial/mvPolynomial.hpp b/include/mvPolynomial/mvPolynomial.hpp
index 9e80c8d..c574bba 100644
--- a/include/mvPolynomial/mvPolynomial.hpp
+++ b/include/mvPolynomial/mvPolynomial.hpp
@@ -151,6 +151,7 @@ class MVPolynomial final {
       : index2value_(std::move(m.index2value_), a) {}
 
   MVPolynomial& operator=(std::initializer_list<value_type> l) {
+    index2value_.clear();
     index2value_.insert(l.begin(), l.end());
     CheckSelfIndexes();
     return *this;