From 32622b43b55a2a6fd99b689c912d43ea412e8403 Mon Sep 17 00:00:00 2001
From: Gonzalo Diaz <devel@gon.cl>
Date: Fri, 25 Oct 2024 11:00:24 -0300
Subject: [PATCH] =?UTF-8?q?[Hacker=20Rank]:=20Project=20Euler=20#1:=20Mult?=
 =?UTF-8?q?iples=20of=203=20and=205=20solved=20=E2=9C=93.=20Coverage=20inc?=
 =?UTF-8?q?reased.?=
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---
 .../src/hackerrank/projecteuler/euler001.cpp  |  7 +++-
 .../projecteuler/euler001.testcases.json      | 34 ++++++++++++++++---
 2 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/src/lib/exercises/src/hackerrank/projecteuler/euler001.cpp b/src/lib/exercises/src/hackerrank/projecteuler/euler001.cpp
index 88de0cb..1bbb37c 100644
--- a/src/lib/exercises/src/hackerrank/projecteuler/euler001.cpp
+++ b/src/lib/exercises/src/hackerrank/projecteuler/euler001.cpp
@@ -43,7 +43,12 @@ unsigned long euler001(int a, int b, int n) {
   // Since, we need the sum of multiples less than N
   n = n - 1;
 
-  unsigned long lcm = (a * b) / gcd(a, b);
+  unsigned long the_gcd = gcd(a, b);
+  if (the_gcd == 0) {
+    return 0;
+  }
+
+  unsigned long lcm = (a * b) / the_gcd;
 
   return sum_of_arithmetic_progression(n, a) +
          sum_of_arithmetic_progression(n, b) -
diff --git a/src/tests/unit/lib/hackerrank/projecteuler/euler001.testcases.json b/src/tests/unit/lib/hackerrank/projecteuler/euler001.testcases.json
index 2021998..333b1ee 100644
--- a/src/tests/unit/lib/hackerrank/projecteuler/euler001.testcases.json
+++ b/src/tests/unit/lib/hackerrank/projecteuler/euler001.testcases.json
@@ -1,6 +1,32 @@
 [
-  { "a": 3, "b": 5, "n": 10, "expected": 23 },
-  { "a": 5, "b": 3, "n": 10, "expected": 23 },
-  { "a": 3, "b": 5, "n": 100, "expected": 2318 },
-  { "a": 3, "b": 5, "n": 1000, "expected": 233168 }
+  {
+    "a": 0,
+    "b": 0,
+    "n": 0,
+    "expected": 0
+  },
+  {
+    "a": 3,
+    "b": 5,
+    "n": 10,
+    "expected": 23
+  },
+  {
+    "a": 5,
+    "b": 3,
+    "n": 10,
+    "expected": 23
+  },
+  {
+    "a": 3,
+    "b": 5,
+    "n": 100,
+    "expected": 2318
+  },
+  {
+    "a": 3,
+    "b": 5,
+    "n": 1000,
+    "expected": 233168
+  }
 ]