From d3fde905b1834e2349603e773db8e8388034e806 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Borba?= <andre.borbaaf2b@gmail.com>
Date: Sat, 19 Sep 2026 09:28:24 -0300
Subject: [PATCH] =?UTF-8?q?=F0=9F=9F=A2=20Port=20problem=201929=20(Concate?=
 =?UTF-8?q?nation=20of=20Array)=20from=20Swift=20to=20C++23?=
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Content-Type: text/plain; charset=UTF-8
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Replaces swift/1929.swift with
solutions/1901-2000/1929-concatenation-of-array/.
---
 .../1901-2000/1929-concatenation-of-array/README.md | 12 ++++++++++++
 .../1929-concatenation-of-array/solution.cpp        | 13 +++++++++++++
 .../1929-concatenation-of-array/solution.hpp        | 10 ++++++++++
 .../1901-2000/1929-concatenation-of-array/test.cpp  |  8 ++++++++
 swift/1929.swift                                    |  9 ---------
 5 files changed, 43 insertions(+), 9 deletions(-)
 create mode 100644 solutions/1901-2000/1929-concatenation-of-array/README.md
 create mode 100644 solutions/1901-2000/1929-concatenation-of-array/solution.cpp
 create mode 100644 solutions/1901-2000/1929-concatenation-of-array/solution.hpp
 create mode 100644 solutions/1901-2000/1929-concatenation-of-array/test.cpp
 delete mode 100644 swift/1929.swift

diff --git a/solutions/1901-2000/1929-concatenation-of-array/README.md b/solutions/1901-2000/1929-concatenation-of-array/README.md
new file mode 100644
index 0000000..77cd357
--- /dev/null
+++ b/solutions/1901-2000/1929-concatenation-of-array/README.md
@@ -0,0 +1,12 @@
+# 1929. Concatenation of Array
+
+[LeetCode problem 1929](https://leetcode.com/problems/concatenation-of-array/)
+
+- **Difficulty**: Easy
+- **Tags**: array, simulation
+
+## Description
+
+Given an integer array `nums` of length `n`, return an array `ans` of length
+`2n` where `ans[i] == nums[i]` and `ans[i + n] == nums[i]` for `0 <= i < n`
+(i.e. `nums` concatenated with itself).
diff --git a/solutions/1901-2000/1929-concatenation-of-array/solution.cpp b/solutions/1901-2000/1929-concatenation-of-array/solution.cpp
new file mode 100644
index 0000000..f75db16
--- /dev/null
+++ b/solutions/1901-2000/1929-concatenation-of-array/solution.cpp
@@ -0,0 +1,13 @@
+#include "solution.hpp"
+
+namespace leetcode::p1929 {
+
+std::vector<int> solve(const std::vector<int>& nums) {
+    std::vector<int> result;
+    result.reserve(nums.size() * 2);
+    result.insert(result.end(), nums.begin(), nums.end());
+    result.insert(result.end(), nums.begin(), nums.end());
+    return result;
+}
+
+} // namespace leetcode::p1929
diff --git a/solutions/1901-2000/1929-concatenation-of-array/solution.hpp b/solutions/1901-2000/1929-concatenation-of-array/solution.hpp
new file mode 100644
index 0000000..39e9a0f
--- /dev/null
+++ b/solutions/1901-2000/1929-concatenation-of-array/solution.hpp
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <vector>
+
+namespace leetcode::p1929 {
+
+// optimized: O(n) time, O(n) space — append nums to a copy of itself.
+std::vector<int> solve(const std::vector<int>& nums);
+
+} // namespace leetcode::p1929
diff --git a/solutions/1901-2000/1929-concatenation-of-array/test.cpp b/solutions/1901-2000/1929-concatenation-of-array/test.cpp
new file mode 100644
index 0000000..ba01b9b
--- /dev/null
+++ b/solutions/1901-2000/1929-concatenation-of-array/test.cpp
@@ -0,0 +1,8 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include "solution.hpp"
+
+TEST_CASE("Problem 1929", "[p1929]") {
+    CHECK(leetcode::p1929::solve({1, 2, 1}) == std::vector<int>{1, 2, 1, 1, 2, 1});
+    CHECK(leetcode::p1929::solve({1, 3, 2, 1}) == std::vector<int>{1, 3, 2, 1, 1, 3, 2, 1});
+}
diff --git a/swift/1929.swift b/swift/1929.swift
deleted file mode 100644
index 9eaf9b8..0000000
--- a/swift/1929.swift
+++ /dev/null
@@ -1,9 +0,0 @@
-func getConcatenation(_ nums: [Int]) -> [Int] {
-    return nums + nums
-}
-
-let test1 = [1,2,1]
-let test2 = [1,3,2,1]
-
-print(getConcatenation(test1)) // [1,2,1,1,2,1]
-print(getConcatenation(test2)) // [1,3,2,1,1,3,2,1]
\ No newline at end of file