Submission #7577766

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Source Code Expand

using System;

class B
{
	static void Main()
	{
		var s = Console.ReadLine();

		var r = 0L;
		for (int i = 0, c; i < s.Length - 1; i++)
		{
			if ((c = Count25(s, i)) == 0) continue;
			r += (long)c * (c + 1) / 2;
			i += 2 * c - 1;
		}
		Console.WriteLine(r);
	}

	static int Count25(string s, int i)
	{
		var c = 0;
		for (; i < s.Length - 1 && s.Substring(i, 2) == "25"; c++, i += 2) ;
		return c;
	}
}

Submission Info

Judge Result