Counting Rectangles Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 1043 Accepted: 546 Description We are given a figure consisting of only horizontal and vertical line segments. Our goal is to count the number of all different rectangles…

Counting rectangles By counting carefully it can be seen that a rectangular grid measuring 3 by 2 contains eighteen rectangles: Although there exists no rectangular grid that contains exactly two million rectangles, find the area of the grid with the…

Description Problem H Counting Rectangles Input: Standard Input Output:Standard Output Time Limit: 3Seconds   Given n points on the XY plane, count how many regular rectanglesare formed. A rectangle is regular if and only if its sides are all paralle…

10574 - Counting Rectangles 题目链接 题意:给定一些点,求可以成几个边平行于坐标轴的矩形 思路:先把点按x排序,再按y排序.然后用O(n^2)的方法找出每条垂直x轴的边,保存这些边两点的y坐标y1, y2.之后把这些边按y1排序,再按y2排序.用O(n)的方法找出有几个连续的y1, y2都相等.那么这些边两两是能构成矩形的.为C2cnt种.然后累加起来就是答案 代码: #include <stdio.h> #include <string.h> #inc…

D. Counting Rectangles is Fun time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output There is an n × m rectangular grid, each cell of the grid contains a single integer: zero or one. Let's call t…

$ >Codeforces \space 372 B.  Counting Rectangles is Fun<$ 题目大意 : 给出一个 \(n \times m\) 的 \(01\) 矩阵,有 \(q\) 次询问,每次给出一个矩形 $ x_1, x_2, y_1, y_2$ ,求有多这个矩形的有多少个全 \(0\) 子矩形 \(1 \leq n, m \leq 50, 1 \leq q \leq 3 \times 10^5\) 解题思路 : 设 \(g(x, y, l, r)\) 表示以…

Description We are given a figure consisting of only horizontal and vertical line segments. Our goal is to count the number of all different rectangles formed by these segments. As an example, the number of rectangles in the Figures 1 and 2 are 5 and…

Given n points on the XY plane, count how many regular rectangles are formed. A rectangle is regular if and only if its sides are all parallel to the axis.InputThe first line contains the number of tests t (1 ≤ t ≤ 10). Each case contains a single lin…

题目链接:http://codeforces.com/problemset/problem/372/B 题意: 给你一个n*m的01矩阵(1 <= n,m <= 40). 然后有t组询问(a,b,c,d),问你: 在以(a,b)为左上角,以(c,d)为左下角,围成的矩形范围中,有多少全是0的矩形. 题解: 这题是dp套dp…… 首先解决dp1: 表示状态: f[a][b][c][d] = Rectangles number 表示左上角为(a,b),右下角的范围在(c,d)以内的全0矩形的个数.…

http://codeforces.com/problemset/problem/372/B 题意:每次给出一个区间,求里面有多少个矩形 思路:预处理,sum[i][j][k][l]代表以k,l为右下角,左上角不超过i,j有多少矩形,然后询问的时候枚举右下角就可以了 #include<cstdio> #include<cmath> #include<algorithm> #include<cstring> #include<iostream> i…