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    <title>COSCON 2025</title>
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    <h3>COSCON 2025 Problems</h3>
    Your Team ID should have been emailed to you. If you do not know your Team ID, please find us in person or ping us on Discord.
    <br><br>
    Welcome! There are <strong>12 problems</strong> worth a total of <strong>212 points</strong>.
    Each problem will require either submission of your solution source code to Codeforces, or
    submission of the files/text comprising your solution to a Google Form. If you have any questions
    about any problems or the competition in general, please direct them to the appropriate channel
    in the <a href="https://discord.gg/CupFyc5Cra" target="_blank">COSCON 2025 Discord server</a>.

    <br><br>
    <h4>Important Information for Codeforces Problems</h4>
    Each team should submit to problems under <strong>ONE CODEFORCES ACCOUNT</strong>.
    <br>
    Problems marked [Codeforces] can be found at <a href="https://codeforces.com/group/bUW9rSzJeG/contests" target="_blank">this link</a>.
    In particular, follow these instructions:
    <ol>
        <li>Create a Codeforces account (if you don't have one already)</li>
        <li>Fill out <a href="https://forms.gle/pXteDwZis3czGPUv9" target="_blank">this form</a> (so we can collect your handles)</li>
        <li>Join the group using the link above (see the "Membership management" panel on right)</li>
        <li>Enter the <strong>COSCON Fall 2025</strong> contest.</li>
        <li>Submit your solution to the appropriate problem (see navbar).</li>
    </ol>
    Codeforces problem will require you to take input from standard input. If you are
    not familiar with this, <a href="problems/IOtemplate.java" target="_blank">here</a> is an example of how to read input in Java.
    <br>
    If you don't have an environment to run Java/Python/etc. on your device, you can try using an online compiler such as <a href="https://www.programiz.com/python-programming/online-compiler/" target="_blank">Programiz</a> or <a href="https://www.jdoodle.com" target="_blank">JDoodle</a>.
    <br>
    If you need more help with this, feel free to come see us in office hours <b>(Friend 108)</b>.

    <br><br>
    <h4>Problem 1: An Encryption Dilemma [5 points]</h4>
    <p>Tags: <sl-badge variant="warning" pill>Programming</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_1.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="primary" outline href="https://codeforces.com/group/bUW9rSzJeG/contest/651434/problem/A" target="_blank">Codeforces Submission</sl-button>
    </div>
    <br>
    <h4>Problem 2: Cell Capture [10 points]</h4>
    <p>Tags: <sl-badge variant="warning" pill>Programming</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_2.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="primary" outline href="https://codeforces.com/group/bUW9rSzJeG/contest/651434/problem/B" target="_blank">Codeforces Submission</sl-button>
    </div>
    <br>
    <h4>Problem 3: Life [20 points]</h4>
    <p>Tags: <sl-badge variant="warning" pill>Programming</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_3.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="primary" outline href="https://codeforces.com/group/bUW9rSzJeG/contest/651434/problem/C" target="_blank">Codeforces Submission (1)</sl-button>
        <sl-button variant="primary" outline href="https://codeforces.com/group/bUW9rSzJeG/contest/651434/problem/D" target="_blank">Codeforces Submission (2)</sl-button>
    </div>
    <br>
    <h4>Problem 4: Virtual Memory [18 points]</h4>
    <p>Tags: <sl-badge variant="danger" pill>Systems</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_4.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="success" outline href="problems/seq3.txt" target="_blank" download>seq3.txt</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/xsx8kEDPfSkqWstt8" target="_blank">Submission</sl-button>
    </div>
    <br>
    <h4>Problem 5: Login Vault [26 points]</h4>
    <p>Tags: <sl-badge variant="neutral" pill>Capture The Flag</sl-badge> <a href="https://en.wikipedia.org/wiki/Capture_the_flag_(cybersecurity)" target="_blank"><sl-icon name="info-circle"></sl-icon></a></p>
    <div class="problem-information">
        <p>In this problem, you will need to interact with our server and find a way to retrieve the flag.</p>
        <p>For Login Vault 2, bypassing authentication is not enough. You need to find the admin password.</p>
        <p>Note: the server has now been disabled. Static files can be found below.</p>
        <sl-button variant="warning" outline href="" target="_blank" disabled>Problem Statement</sl-button>
        <sl-button variant="warning" outline href="problems/login-vault" target="_blank">Archive</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/qdQNkhwfpNpvGJyx5" target="_blank">Submission</sl-button>
    </div>
    <br>
    <h4>Problem 6: Tetris Melons [20 points]</h4>
    <p>Tags: <sl-badge variant="purple" pill>Optimization</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_6.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="success" outline href="https://drive.google.com/drive/folders/13OcADbwC4KqAwV88Wv0Y4_NhCziahHn1" target="_blank" download>Starter Code</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/PNZkDrQfYDG2rjfP8" target="_blank">File Submission</sl-button>
    </div>
    <br>
    <h4>Problem 7: PSet Groups [18 points]</h4>
    <p>Tags: <sl-badge variant="primary" pill>Theory</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_7.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/3B8HsDi28VsREJX58" target="_blank">File Submission</sl-button>
    </div>
    <br>
    <h4>Problem 8: Fall Foliage [20 points]</h4>
    <p>Tags: <sl-badge variant="primary" pill>Theory</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_8.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/8Di5bBo73TCf415Z8" target="_blank">File Submission</sl-button>
    </div>
    <br>
    <h4>Problem 9: Let It Glow! [20 points]</h4>
    <p>Tags: <sl-badge variant="purple" pill>Optimization</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_9.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="success" outline href="problems/let_it_glow_client.py" target="_blank" download>Starter Code</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/atshF7gRUEq13iw29" target="_blank">Submission</sl-button>
    </div>
    <br>
    <h4>Problem 10: Caching [20 points]</h4>
    <p>Tags: <sl-badge variant="danger" pill>Systems</sl-badge></p>
    <div class="problem-information">
        <sl-button variant="warning" outline href="problems/Problem_10.pdf" target="_blank">Problem Statement</sl-button>
        <sl-button variant="success" outline href="problems/alloc.c" target="_blank" download>alloc.c</sl-button>
        <sl-button variant="success" outline href="problems/alloc.h" target="_blank" download>alloc.h</sl-button>
        <sl-button variant="success" outline href="problems/cache.h" target="_blank" download>cache.h</sl-button>
        <sl-button variant="success" outline href="problems/grader.c" target="_blank" download>grader.c</sl-button>
        <sl-button variant="success" outline href="problems/starter.c" target="_blank" download>starter.c (Starter Code)</sl-button>
        <sl-button variant="success" outline href="problems/easyexinp.txt" target="_blank" download>Sample Input (Task 1)</sl-button>
        <sl-button variant="success" outline href="problems/mainexinp.txt" target="_blank" download>Sample Input (Task 2)</sl-button>
        <sl-button variant="primary" outline href="https://forms.gle/QkqL8pSoDN1daNNS7" target="_blank">Submission</sl-button>
    </div>
    <br>
    <h4>Problem A: COSCON Trading Challenge [20 points]</h4>
    <p>Tags: <sl-badge variant="neutral" pill>Trading</sl-badge></p>
    <div class="problem-information">
        <p>Live event</p>
        <sl-button variant="warning" outline href="https://docs.google.com/presentation/d/1IdG-BRciwLEx8H44zZCwCZKzWxjk8ixrCBDYZc8c7EE/edit?usp=sharing" target="_blank">Slides</sl-button>
    </div>
    <br>
    <h4>Problem B: Castle Invasion [15 points]</h4>
    <p>Tags: <sl-badge variant="primary" pill>Game Theory</sl-badge></p>
    <div class="problem-information">
        <p>Check #announcements in the Discord for updates</p>
        <sl-button variant="warning" outline href="problems/Problem_B.pdf" target="_blank">Problem Statement</sl-button>
    </div>

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