From 6ddff0f72c48883d84f00dda5343aaf253d20819 Mon Sep 17 00:00:00 2001
From: Allen Guan <me@nella17.tw>
Date: Sat, 30 Oct 2021 18:38:40 +0800
Subject: [PATCH] fix sign-compare warning

---
 math/prime_numbers.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/math/prime_numbers.cpp b/math/prime_numbers.cpp
index d86be116b..00c25a411 100644
--- a/math/prime_numbers.cpp
+++ b/math/prime_numbers.cpp
@@ -9,7 +9,7 @@
 /** Generate an increasingly large number of primes
  * and store in a list
  */
-std::vector<int> primes(int max) {
+std::vector<int> primes(size_t max) {
     std::vector<int> res;
     std::vector<bool> is_not_prime(max + 1, false);
     for (size_t i = 2; i <= max; i++) {