摘要：
D. Counting Rectangles is Funtime limit per test4 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere is ann × mrectangular grid, each cell of the grid contains a single integer: zero or one. Let's call the cell on thei-th row and thej-th column as(i, j).L 阅读全文
