摘要：
Given a linear equation of n variables, find the total number of non-negative integer solutions of it. All coefficients are positive. Example: input: 阅读全文
摘要：
You are given a series of arithmetic equations as a string, such as: y = x + 1 5 = x + 3 10 = z + y + 2 The equations use addition only and are separa 阅读全文