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LeetCode "Largest Rectangle in Histogram" - TRICKY MONO-QUEUE
I got a DP solution first which is O(n^2). Apparently it is not a optimized one - think about: it is linear value space. There must be O(n) solution.A...
分类:其他好文   时间:2014-08-15 05:04:07    阅读次数:249
CSU 1424 Qz’s Maximum All One Square
Description       YH gave Qz an odd matrix consists of one or zero. He asked Qz to find a square that has the largest area. The problem is not so easy, that means the square you find must not contai...
分类:其他好文   时间:2014-08-12 19:11:04    阅读次数:208
hdu 1506 Largest Rectangle in a Histogram
Largest Rectangle in a Histogram Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 11248    Accepted Submission(s): 3088 Problem Descrip...
分类:其他好文   时间:2014-08-11 21:36:22    阅读次数:291
HDU 2870 Largest Submatrix(DP)
题意 求最大相同字符子矩阵 其中一些字符可以转换 其实就是HDU1505 1506的加强版 但是分了a,b,c三种情况 看哪次得到的面积最大 对于某一个情况 可以把该字符和可以转换为该字符的位置赋值0 其它位置赋值1 这样就转化成了求最大全0矩阵的问题了 对于转换后矩阵中的每个点 看他向上有多少个连续0 把这个值存在h数组中 再用l数组和r数组记录h连续大于等于该位置的最左边位置和最右位置 这样包含(i,j)点的最大矩阵面积就是(r[i][j]-l[i][j]+1)*h[i][j] 面积最大的点就...
分类:其他好文   时间:2014-08-11 15:04:42    阅读次数:195
UVA - 11920 0 s, 1 s and ? Marks
Description  0 s, 1 s and ? Marks  Given a string consisting of 0, 1 and ? only, change all the ? to 0/1, so that the size of the largest group is minimized. A group is a subs...
分类:其他好文   时间:2014-08-11 11:57:42    阅读次数:197
事件轮询 event loop
Understanding the node.js event loopThe first basic thesis of node.js is that I/O is expensive:So the largest waste with current programming technolog...
分类:其他好文   时间:2014-08-10 21:21:30    阅读次数:469
[leetcode]Maximum Subarray
Maximum SubarrayFind the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array[?...
分类:其他好文   时间:2014-08-10 21:18:20    阅读次数:232
hdu1506(dp)
Largest Rectangle in a HistogramTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 11219Accepted Subm...
分类:其他好文   时间:2014-08-10 18:24:20    阅读次数:225
每日一dp(1)——Largest Rectangle in a Histogram(poj 2559)使用单调队列优化
思路1. 当前为n的面积如何与n-1相联系,dp[i][j]=max(dp[i-1][k]) , 0<k<=j 描述:i为方块个数,j为高度 但是此题目的数据对于高度太变态,h,1000000000 ,n,100000 所以不可行(一般计算机为Ghz 相当于1S十几亿运算) 思路2. 此题目寻找的最大面积,对于一个方块来说则是以自己为中心左右两端比自己高 的方块累计和与自己面积的乘积,取最大值。状态转移则可看作已知前面n-1个左边比自己 高的的位置l[i],则如果该下标对应的数据比自己还高,继续往下找。利...
分类:其他好文   时间:2014-08-10 13:09:30    阅读次数:278
LeetCode——Maximum Subarray
Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [?2,1,?3,4,?1,2,1,?5,4], the contiguous subarray [4,?1,2,1] ha...
分类:其他好文   时间:2014-08-05 22:37:50    阅读次数:188
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