Submission #1503674

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Source Code Expand

import std.algorithm,
       std.string,
       std.array,
       std.range,
       std.stdio,
       std.conv;

void swap(ref ulong[] arr, ulong a, ulong b) {
  ulong t = arr[a];
  arr[a] = arr[b];
  arr[b] = t;
}

void main() {
  ulong[] arr = [1, 2, 3, 4, 5, 6];
  ulong n = readln.chomp.to!(ulong);

  if (n >= 30) {
    ulong[] cache;

    foreach (i; 0..30) {
      swap(arr, (i % 5), (i % 5) + 1);
      cache ~= arr.to!(string[]).join.to!ulong;
    }

    writeln(cache[(n-1) % 30]);
  } else {
    foreach (i; 0..n) {
      swap(arr, (i % 5), (i % 5) + 1);
    }

    writeln(arr.to!(string[]).join);
  }
}

Submission Info

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