UVa10025 ? 1 ? 2 ? ... ? n = k problem The problem Given the following formula, one can set operators '+' or '-' instead of each '?', in order to obtain a given k? 1 ? 2 ? ... ? n = k For example: to obtain k = 12 , the expression to be used will be:…
B. Tell Your World time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Connect the countless points with lines, till we reach the faraway yonder. There are n points on a coordinate plane, the i…
Year 2118. Androids are in mass production for decades now, and they do all the work for humans. But androids have to go to school to be able to solve creative tasks. Just like humans before. It turns out that high school struggles are not gone. If s…
思维:思维就是将大的矩形放在小矩形里面,让大矩形的宽和长尽量靠近. 很容易得到 (a+b)% i = 0 的话, 保证了大矩形的形成,同时里面表示了两种情况:1, a % i =0, b % i=0; 2, (a%i + b % i) % i =0 当然,第一种情况是第二种的特殊情况,但是,我还是想把它写出来, 同时, 这个 i 必须大于 a和 b共同的 第一个 因子(不必是共同因子,第一的顺序是只从大到小的顺序中第一次大于等于)至于,为什么自己可以画画图,就很明白了.当然,要证明的话,直…
Description Katya studies in a fifth grade. Recently her class studied right triangles and the Pythagorean theorem. It appeared, that there are triples of positive integers such that you can construct a right triangle with segments of lengths corresp…
