To find the two smallest elements when comparing 15n^2 elements, you can use a sorting algorithm such as quicksort or mergesort to sort the elements in ascending order. Once the elements are sorted, the first two elements in the sorted array will be the two smallest elements. This approach has a time complexity of O(n^2 log n) for quicksort and O(n^2) for mergesort, where n is the number of elements. Alternatively, you can use a linear time algorithm such as finding the minimum and second minimum elements in a single pass through the array, which has a time complexity of O(n). **

Tier 7 is the highest level in a tiered system, typically used to classify or rank items based on their quality, importance, or performance. In some contexts, Tier 7 may represent the top tier or the most advanced level within a specific category. It often signifies excellence, superiority, or top-tier status. **

Tier 9 typically refers to the highest level of a ranking or classification system. In the context of video games, it may refer to the highest tier of gear or equipment that a player can obtain. In other contexts, it may refer to the highest level of performance or achievement in a particular area. Overall, Tier 9 represents the pinnacle or top level within a specific hierarchy or system. **

The main difference between the Master tier and the Challenger tier in competitive gaming, particularly in games like League of Legends, is the level of skill and competition. The Challenger tier is the highest rank achievable and is reserved for the top 200 players in a region, while the Master tier is the tier just below Challenger. Players in the Challenger tier are considered to be among the best in the world, while those in the Master tier are still highly skilled but have not yet reached the top 200. The competition and skill level in the Challenger tier are generally considered to be more intense and challenging compared to the Master tier. **

The white stripes on dark elements of a monitor are often a result of a phenomenon called "screen tearing." This occurs when the monitor's refresh rate does not match the frame rate of the content being displayed, causing the image to appear torn or have white stripes. It can also be a result of a mismatch between the graphics card's output and the monitor's refresh rate. Adjusting the monitor's settings or using a graphics card with adaptive sync technology can help reduce or eliminate this issue. **

To remove the white border around black elements, one can use image editing software such as Photoshop or GIMP. First, select the black elements using the magic wand tool or the selection tool. Then, refine the selection to ensure that only the black elements are selected. Next, invert the selection so that the white border is selected instead. Finally, delete or fill the selected white border with black color to remove it from the image. **

The element with an atomic number of 2 is helium. Helium is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. It is the second lightest element and is the second most abundant element in the observable universe, being present at about 24% of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined. **

Both Pokémon Black/White and Pokémon Black 2/White 2 are great games in the Pokémon series, each offering unique features and storylines. Pokémon Black 2/White 2 is considered by many fans to be the superior game due to its expanded storyline, more diverse Pokémon selection, and additional features like the Pokémon World Tournament. However, some players prefer the original Black/White for its more focused narrative and introduction of the Unova region. Ultimately, the choice between the two games comes down to personal preference and what aspects of the games are most important to the player. **