POJ 2135 Farm Tour(最小费用最大流)
Description When FJ’s friends visit him on the fa […]...
POJ 2887 Big String(fhq Treap)
Description You are given a string and supposed to do s […]...
POJ 1840: Eqs(hash)
Description 给出一个5元3次方程,输入其5个系数,求它的解的个数 其中系数 ai∈[-50,50] […]...