I had a basically identical solution to you for the first two test cases. I
made one change to my solution in an attempt to make it more efficient for the
hidden test case. I switched from concatenating strings to using a
StringBuilder (I was concerned about memory too).
Can't spot anything else with your code that might cause a timeout. Try change
the strings to use StringBuilder and let me know if that makes the difference!
My attempt:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace codejam2019
{
class Program
{
static void Main(string[] args)
{
int t;
int.TryParse(Console.ReadLine(), out t);
for (int i = 1; i <= t; ++i)
{
int n;
int.TryParse(Console.ReadLine(), out n);
string usedMoves = Console.ReadLine();
StringBuilder newMoves = new StringBuilder("",
usedMoves.Length);
for(int j = 0; j < usedMoves.Length; j++)
{
if (usedMoves[j] == 'S')
{
newMoves.Append('E');
} else
{
newMoves.Append('S');
}
}
Console.WriteLine("Case #" + i + ": " + newMoves);
}
}
}
}
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