Problem solving

staircase.cs

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+using System.CodeDom.Compiler;
+using System.Collections.Generic;
+using System.Collections;
+using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Serialization;
+using System.Text.RegularExpressions;
+using System.Text;
+using System;
+
+class Solution {
+
+    // Complete the staircase function below.
+    static void staircase(int n) {
+        for (int i = 0; i < n; i++) {
+            int a = n - (n-1);
+            a+=i;
+            string b = "";
+
+            if (i != n-1) {
+                b = new string(' ', n-i-1);
+            }
+
+            string c = new string('#', a);
+
+            Console.WriteLine(b + c);
+        }
+    }
+
+    static void Main(string[] args) {
+        int n = Convert.ToInt32(Console.ReadLine());
+
+        staircase(n);
+    }
+}