NP-complete by Ciro Santilli 37 Updated 2025-07-16
A problem that is both NP and NP-hard.
"Because You Loved Me: The Songs of Diane Warren" is a tribute album featuring the works of Diane Warren, a celebrated songwriter known for her contributions to pop and rock music. Released in 1995, the album includes a collection of songs that she wrote, performed by various artists. Some of the songs on the album were previously well-known hits, while others may have been less familiar to the audience.
"Challenge" is an album by the Norwegian electronic music artist and producer, **Lindstrøm**, released in 2017. The album features a blend of electronic, disco, and house music elements, characteristic of Lindstrøm's style. Known for his innovative soundscapes and production techniques, "Challenge" showcases his ability to create immersive audio experiences that often transport listeners to different realms.
Korn Kovers is a series of cover songs performed by the American nu-metal band Korn. The band has released several covers of songs from various genres and artists, showcasing their unique style and interpretation. The project includes tracks that often blend Korn's signature heavy sound with other artists’ material, reflecting their influences and musical diversity. Some of these covers may come from live performances or special editions of their albums.
"Christmas Song Book" is an album by Mina, an Italian singer known for her powerful voice and significant contributions to the pop and jazz genres. Released in 1970, the album features a selection of Christmas songs, showcasing Mina's interpretation of classic holiday tunes. The collection typically includes both traditional carols and festive songs, allowing listeners to enjoy a blend of familiar melodies and Mina's distinctive vocal style. This album is part of her extensive discography and reflects her versatility as an artist.
"Clásicos de la Provincia II" is an album by the Puerto Rican singer-songwriter Diomedes Díaz, known for his contributions to the vallenato genre. This album features a collection of classic vallenato songs that highlight Díaz's vocal talent and storytelling abilities. It showcases his deep connection to the traditional music of the Caribbean region and pays homage to the culture and emotions associated with it.
"Counterfeit 2" refers to a series of digital characters and images produced by the artist known as "Counterfeit." Specifically, it has gained attention in the realm of digital art and artificial intelligence. The project often explores themes of authenticity, identity, and the blurred lines between real and artificial creations.
"Cover Magazine" is a studio album by the South Korean music group 2AM, released on April 20, 2014. The album features a collection of cover songs by various artists, showcasing the vocal talents of the group members. 2AM is known for their strong vocal harmonies and emotional ballads, and this album allows them to express their interpretations of well-known songs.
"Dark Hope" can refer to several different concepts, depending on the context in which it is used: 1. **Literature and Media**: "Dark Hope" might be a title or a theme in books, movies, or television series that deals with darker themes of hope, despair, or the struggle against adversity.
"Ella Fitzgerald's Christmas" typically refers to the holiday music album titled "Ella Fitzgerald's Christmas," which features the renowned jazz singer's interpretations of classic Christmas songs. Released in 1960, the album includes beloved holiday tracks such as "Jingle Bells," "Frosty the Snowman," and "Santa Claus Is Coming to Town," showcasing Fitzgerald's rich voice and unique vocal style. The album captures the festive spirit of the season while highlighting Fitzgerald's exceptional talent as a vocalist.
"Eoghan Quigg" is the self-titled debut album by Irish singer Eoghan Quigg, who gained fame as a contestant on the reality television show "The X Factor" in 2008. The album was released in 2009 and features a mix of pop songs, including original tracks and covers. Eoghan's style is characterized by his youthful voice and pop sensibilities, and the album includes his interpretation of popular songs as well as some new material written for him.
"Fakebook" is an album by the American indie rock band The Fiery Furnaces, released on March 22, 2005. It is notable for its lo-fi production style and consists of a collection of original songs and covers. The album's sound diverges from the band's earlier work, featuring simpler arrangements and a more acoustic aesthetic. "Fakebook" reflects the band's eclectic influences and showcases their distinctive songwriting and vocal harmonies.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 2.
    You can publish local OurBigBook lightweight markup files to either https://OurBigBook.com or as a static website
    .
    Figure 3.
    Visual Studio Code extension installation
    .
    Figure 4.
    Visual Studio Code extension tree navigation
    .
    Figure 5.
    Web editor
    . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
    Video 4.
    OurBigBook Visual Studio Code extension editing and navigation demo
    . Source.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact