摘要： Problem Description After Xiaoteng took a math class, he learned a lot of different shapes, but Xiaoteng's favorite triangle is because he likes stabl 阅读全文

摘要： Pattern lock security is generally used in Android handsets instead of a password. The pattern lock can be set by joining points on a 3 × 3 matrix in 阅读全文

摘要： 描述 在一张2D地图上有N座城市，坐标依次是(X1, Y1), (X2, Y2), ... (XN, YN)。 现在H国要修建一条平行于X轴的天然气主管道。这条管道非常长，可以认为是一条平行于X轴的直线。 小Ho想知道如何修建这条管道，可以使N座城市到管道的垂直距离之和最小。请你求出这个最小的距离之 阅读全文

摘要： Do you know the twin prime conjecture? Two primes and are called twin primes if . The twin prime conjecture is an unsolved problem in mathematics, whi 阅读全文