🟢 Port problem 1550 (Three Consecutive Odds) from Swift to C++23

solutions/1501-1600/1550-three-consecutive-odds/README.md

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+# 1550. Three Consecutive Odds
+
+[LeetCode problem 1550](https://leetcode.com/problems/three-consecutive-odds/)
+
+- **Difficulty**: Easy
+- **Tags**: array
+
+## Description
+
+Given an integer array `arr`, return `true` if there are three consecutive
+odd numbers in it, `false` otherwise.

solutions/1501-1600/1550-three-consecutive-odds/solution.cpp

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+#include "solution.hpp"
+
+namespace leetcode::p1550 {
+
+bool solve(const std::vector<int>& arr) {
+    int consecutiveOdds = 0;
+
+    for (int value : arr) {
+        if (value % 2 != 0) {
+            ++consecutiveOdds;
+            if (consecutiveOdds == 3) {
+                return true;
+            }
+        } else {
+            consecutiveOdds = 0;
+        }
+    }
+
+    return false;
+}
+
+} // namespace leetcode::p1550

solutions/1501-1600/1550-three-consecutive-odds/solution.hpp

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+#pragma once
+
+#include <vector>
+
+namespace leetcode::p1550 {
+
+// optimized: O(n) time, O(1) space — track a running count of consecutive
+// odd values, reset it on any even one.
+bool solve(const std::vector<int>& arr);
+
+} // namespace leetcode::p1550

solutions/1501-1600/1550-three-consecutive-odds/test.cpp

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+#include <catch2/catch_test_macros.hpp>
+
+#include "solution.hpp"
+
+TEST_CASE("Problem 1550", "[p1550]") {
+    CHECK_FALSE(leetcode::p1550::solve({2, 6, 4, 1}));
+    CHECK(leetcode::p1550::solve({1, 2, 34, 3, 4, 5, 7, 23, 12}));
+}