Problem Description Now here is a matrix with letter 'a','b','c','w','x','y','z' and you can change 'w' to 'a' or 'b', change 'x' to 'b' or 'c', change 'y' to 'a' or 'c', and change 'z' to 'a', 'b' or 'c'. After you changed it, what's the largest sub…

http://acm.hdu.edu.cn/showproblem.php? pid=2870 Largest Submatrix Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1569    Accepted Submission(s): 748 Problem Description Now here is a matrix wi…

这三道题的关系是这样的,1505是1506的加强版,2870又是1505的加强版 如果按照上面由简到易的顺序来做的话,还是很简单的 这道题的思想就是 枚举+DP 因为某些字符可以变值,所以我们枚举a, b, c三个矩阵 分别求出对应的h数组以及最大子矩阵,再在里面求出一个最大值即可. //#define LOCAL #include <iostream> #include <cstdio> #include <cstring> #include <algorith…

Largest Submatrix Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2018    Accepted Submission(s): 967 Problem Description Now here is a matrix with letter 'a','b','c','w','x','y','z' and you ca…

POJ 2796 Feel Good HDU 1506 Largest Rectangle in a Histogram 和这两题一样的方法. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> using namespace std; +; int a[maxn]; int L[maxn],R[maxn]; int m,n; int tmp[maxn][maxn],b…

Largest Submatrix of All 1’s Time Limit: 5000MS   Memory Limit: 131072K Total Submissions: 8551   Accepted: 3089 Case Time Limit: 2000MS Description Given a m-by-n (0,1)-matrix, of all its submatrices of all 1’s which is the largest? By largest we me…

Given a m-by-n (0,1)-matrix, of all its submatrices of all 1’s which is the largest? By largest we mean that the submatrix has the most elements. Input The input contains multiple test cases. Each test case begins with m and n (1 ≤ m, n ≤ 2000) on li…

codeforces 407D Largest Submatrix 3 题意 找出最大子矩阵,须满足矩阵内的元素互不相等. 题解 官方做法 http://codeforces.com/blog/entry/11333 \(O(n^6)\) 枚举子矩阵,暴力check. \(O(n^4)\) 枚举上下边界,双指针. \(O(n^3log_2n)\) 假设当前上边界 \(up\), 下边界 \(down\),\(R_i\) 表示当 \(i\) 为左边界时,右边界最大是 \(R_i\). 当 \(do…

Given a m-by-n (0,1)-matrix, of all its submatrices of all 1's which is the largest? By largest we mean that the submatrix has the most elements. Input The input contains multiple test cases. Each test case begins with m and n (1 ≤ m, n ≤ 2000) on li…

POJ 3494 Largest Submatrix of All 1’s Description Given a m-by-n (0,1)-matrix, of all its submatrices of all 1’s which is the largest? By largest we mean that the submatrix has the most elements. Input The input contains multiple test cases. Each tes…