二维矩阵查询

Question

有人可以帮助我了解这段代码的含义吗？

 int m = matrix.size(), n = m? matrix[0].size(): 0, r = 0, c = n - 1;

Answer 1

更容易阅读相同代码的版本：

 int m = matrix.size(); // get number of rows int n = m? matrix[0].size(): 0; // if there are columns, then n becomes the number of columns, zero otherwise int r = 0; int c = n - 1;