Alice is performing a magic trick. She has a standard deck of 52 cards, which she may order beforehand. She invites a volunteer to pick an integer \(0\le n\le 52\), and cuts the deck into a pile with the top \(n\) cards and a pile with the remaining \(52-n\). She then gives both piles to the volunteer, who riffles them together and hands the deck back to her face down. (Thus, in the resulting deck,     the cards that were in the deck of size \(n\)     appear in order, as do the cards that were in the deck of size \(52-n\).)

Alice then flips the cards over one-by-one from the top. Before flipping over each card, she may choose to guess the color of the card she is about to flip over. She stops if she guesses incorrectly. What is the maximum number of correct guesses she can guarantee?

[i]Proposed by Espen Slettnes[/i]
To solve this problem, we need to determine the maximum number of correct guesses Alice can guarantee when flipping over the cards after the volunteer has riffled the two piles together. 

1. **Understanding the Riffle Shuffle:**
   - The volunteer picks an integer \(0 \le n \le 52\) and cuts the deck into two piles: one with the top \(n\) cards and the other with the remaining \(52 - n\) cards.
   - The volunteer then riffles the two piles together. This means that the cards from the two piles are interleaved, but the order within each pile is preserved.

2. **Analyzing the Problem:**
   - Alice needs to guess the color of the card she is about to flip over. She stops if she guesses incorrectly.
   - The goal is to find the maximum number of correct guesses Alice can guarantee.

3. **Strategy for Maximum Guesses:**
   - Consider the worst-case scenario where Alice has no information about the order of the cards after the riffle shuffle.
   - The key observation is that the cards from each pile remain in their original order within the shuffled deck.

4. **Optimal Strategy:**
   - Alice can guarantee 26 correct guesses by alternating the colors of the cards in the deck before the volunteer cuts and shuffles them.
   - For example, if Alice arranges the deck such that the cards alternate between red and black, she can ensure that every other card is a different color.

5. **Detailed Steps:**
   - Suppose Alice arranges the deck such that the cards alternate between red and black.
   - When the volunteer cuts the deck into two piles and riffles them together, the resulting deck will still have alternating colors, though the exact sequence may vary.
   - Alice can then guess the color of every other card with certainty. For instance, if she starts by guessing the top card is black, she can continue guessing black for every other card.

6. **Guaranteeing 26 Correct Guesses:**
   - By alternating the colors in the deck, Alice ensures that she can guess the color of every other card correctly.
   - Since there are 52 cards in total, this strategy guarantees that Alice can guess at least 26 cards correctly.

The final answer is \(\boxed{26}\).