From 24a9c53222191d82de5005fd046457d27c4e741a Mon Sep 17 00:00:00 2001
From: Gonzalo Diaz <devel@gon.cl>
Date: Tue, 21 May 2024 17:24:37 -0400
Subject: [PATCH] =?UTF-8?q?[Hacker=20Rank]:=20Warmup:=20Staircase=20solved?=
 =?UTF-8?q?=20=E2=9C=93?=
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---
 .../src/hackerrank/warmup/Staircase.Test.cs   | 24 +++++++
 .../src/hackerrank/warmup/Staircase.cs        | 38 +++++++++++
 docs/hackerrank/warmup/staircase.md           | 67 +++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 algorithm-exercises-csharp-test/src/hackerrank/warmup/Staircase.Test.cs
 create mode 100644 algorithm-exercises-csharp/src/hackerrank/warmup/Staircase.cs
 create mode 100644 docs/hackerrank/warmup/staircase.md

diff --git a/algorithm-exercises-csharp-test/src/hackerrank/warmup/Staircase.Test.cs b/algorithm-exercises-csharp-test/src/hackerrank/warmup/Staircase.Test.cs
new file mode 100644
index 0000000..8f57bbf
--- /dev/null
+++ b/algorithm-exercises-csharp-test/src/hackerrank/warmup/Staircase.Test.cs
@@ -0,0 +1,24 @@
+namespace algorithm_exercises_csharp.hackerrank;
+
+[TestClass]
+public class StaircaseTest
+{
+  [TestMethod]
+  public void testStaircase()
+  {
+    int input = 6;
+    string expectedAnswer = String.Join("\n",
+      "     #",
+      "    ##",
+      "   ###",
+      "  ####",
+      " #####",
+      "######"
+    );
+
+    string result = Staircase.staircase(input);
+
+    Assert.AreEqual(expectedAnswer, result);
+  }
+}
+
diff --git a/algorithm-exercises-csharp/src/hackerrank/warmup/Staircase.cs b/algorithm-exercises-csharp/src/hackerrank/warmup/Staircase.cs
new file mode 100644
index 0000000..10e7f0c
--- /dev/null
+++ b/algorithm-exercises-csharp/src/hackerrank/warmup/Staircase.cs
@@ -0,0 +1,38 @@
+// @link Problem definition [[docs/hackerrank/warmup/staircase.md]]
+
+namespace algorithm_exercises_csharp.hackerrank;
+
+using System.Text;
+using System.Diagnostics.CodeAnalysis;
+
+public class Staircase
+{
+  [ExcludeFromCodeCoverage]
+  protected Staircase() { }
+
+  public static string staircase(int _n)
+  {
+    List<string> result = [];
+
+    for (int i = 1; i < _n + 1; i++)
+    {
+      StringBuilder line = new();
+
+      for (int j = 1; j < _n + 1; j++)
+      {
+        if (j <= _n - i)
+        {
+          line.Append(' ');
+        }
+        else
+        {
+          line.Append('#');
+        }
+      }
+
+      result.Add(line.ToString());
+    }
+    return String.Join("\n", result);
+  }
+
+}
diff --git a/docs/hackerrank/warmup/staircase.md b/docs/hackerrank/warmup/staircase.md
new file mode 100644
index 0000000..201bcc1
--- /dev/null
+++ b/docs/hackerrank/warmup/staircase.md
@@ -0,0 +1,67 @@
+# [Staircase](https://www.hackerrank.com/challenges/staircase)
+
+Difficulty: #easy
+Category: #warmup
+
+Staircase detail
+This is a staircase of size $ n = 4 $:
+
+```text
+   #
+  ##
+ ###
+####
+```
+
+Its base and height are both equal to n. It is drawn using # symbols
+and spaces. The last line is not preceded by any spaces.
+
+Write a program that prints a staircase of size n.
+
+## Function Description
+
+Complete the staircase function in the editor below.
+
+staircase has the following parameter(s):
+
+* int n: an integer
+
+## Print
+
+Print a staircase as described above.
+
+## Input Format
+
+A single integer, , denoting the size of the staircase.
+
+Constraints
+
+$ 0 < n \leq 100 $
+
+## Output Format
+
+Print a staircase of size n using # symbols and spaces.
+
+Note: The last line must have  spaces in it.
+
+## Sample Input
+
+```text
+6
+```
+
+## Sample Output
+
+```text
+     #
+    ##
+   ###
+  ####
+ #####
+######
+```
+
+## Explanation
+
+The staircase is right-aligned, composed of # symbols and spaces,
+and has a height and width of $ n = 6 $.