[Init] Solved solutions

cs/451B.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _451B
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            int n = int.Parse(Console.ReadLine());
+            int[] a = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
+            int i = 0, c = 0, l = 1, r = 1;
+            bool b = false;
+            while (i < n - 1)
+            {
+                if (a[i] < a[i + 1])
+                {
+                    i++;
+                }
+                else
+                {
+                    int j = i;
+                    while (j < n - 1 && a[j] > a[j + 1])
+                    {
+                        j++;
+                    }
+                    l = i + 1;
+                    r = j + 1;
+                    c++;
+                    i = r;
+                }
+            }
+            if (c < 2)
+            {
+                int c1 = l > 1 ? a[l - 2] : 0;
+                int c2 = r < n ? a[r] : int.MaxValue;
+                if (a[r - 1] > c1 && a[l - 1] < c2)
+                {
+                    b = true;
+                }
+                
+            }
+            if (b)
+            {
+                Console.WriteLine("yes");
+                Console.WriteLine("{0} {1}", l, r);
+            }
+            else
+            {
+                Console.WriteLine("no");
+            }
+        }
+    }
+}