From 53f70212f827621fe1bc84ab96ff332d53344117 Mon Sep 17 00:00:00 2001
From: ChenHaoHSU <chhsu@eda.ee.ntu.edu.tw>
Date: Mon, 6 Oct 2025 14:27:05 -0500
Subject: [PATCH] Add constant term in DoubleLinearExpr::AddExpression

---
 ortools/sat/cp_model.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ortools/sat/cp_model.cc b/ortools/sat/cp_model.cc
index 30a888d3d8..a280ef3fcb 100644
--- a/ortools/sat/cp_model.cc
+++ b/ortools/sat/cp_model.cc
@@ -409,13 +409,13 @@ DoubleLinearExpr& DoubleLinearExpr::AddTerm(BoolVar var, double coeff) {
 
 DoubleLinearExpr& DoubleLinearExpr::AddExpression(const LinearExpr& expr,
                                                   double coeff) {
+  constant_ += static_cast<double>(expr.constant()) * coeff;
   const std::vector<int>& indices = expr.variables();
   const std::vector<int64_t> coefficients = expr.coefficients();
   for (int i = 0; i < indices.size(); ++i) {
     variables_.push_back(indices[i]);
     coefficients_.push_back(1.0 * static_cast<double>(coefficients[i]) * coeff);
   }
-
   return *this;
 }