Countdown Game & Solver

倒计时是英国电视上的一个游戏节目（法语原文：Des chiffres et des lettres）。此应用程序将游戏节目的“数字”部分重新设计为适用于iPhone或iPad的类似Scrabble®的平铺游戏。它包括一个Universal Solver，它可以找到你想要投入的任何Numbers谜题的所有可能的解决方案。
功能列表：
•倒数游戏节目的“数字”回合，重新制作为类似Scrabble®的平铺游戏。
•您可以使用超过1100万种独特的起动配置。 （确切的数字是11 918 700.）
•通过将编号的图块拖动到游戏板上来玩游戏，并逐步将算术表达式构建为与目标编号匹配的最终结果（或者在其中的十个之内）。
•包括一个Universal Solver，可在几秒钟内找到给定初始配置的所有可能解决方案。此外，如果找不到解决方案，您可以确定不存在解决方案。
•在生成解决方案列表时，Universal Solver会识别与现有解决方案几乎相同的新解决方案 - 例如，算术表达式的顺序略有不同 - 并剔除此类新解决方案以保留列表解决方案可管理。
•与Apple的消息应用程序完全集成，因此您可以与朋友分享您的成就并向他们发出挑战。
•一个可在所有iOS设备上运行的通用应用程序：iPhone，iPad和/或iPod touch。
以上翻译由谷歌翻译提供。英文原文如下。

Countdown is a game show on British television (French original: Des chiffres et des lettres). This app reworks the “Numbers” portion of the game show as a Scrabble®-like tile game for your iPhone or iPad. It includes a Universal Solver that finds all possible solutions to any Numbers puzzle you care to throw at it.
Feature List:
• The “Numbers” rounds of the Countdown game show, reworked as a Scrabble®-like tile game.
• More than 11 million unique starting configurations at your disposal. (The precise figure is 11 918 700.)
• Play the game by dragging numbered tiles onto the game board and progressively building up arithmetic expressions to a final result that matches the target number (or comes within ten of it).
• Includes a Universal Solver that finds, within a few seconds, all possible solutions for a given initial configuration. Furthermore, if no solution is found, you can be sure that no solution exists.
• In generating the list of solutions, the Universal Solver recognizes new solutions that are near-duplicates of pre-existing solutions — e.g., with minor variations in the order of the arithmetic expressions — and culls such new solutions in order to the keep the list of solutions manageable.
• Fully integrated with Apple’s Messages app, so you can share your accomplishments with your friends and issue challenges to them.
• A single universal app which runs on all your iOS devices: iPhone, iPad, and/or iPod touch.