题目分析: 没啥好说的,会单调栈就会做. 代码: #include<bits/stdc++.h> using namespace std; ; ; int n,k; int pre[maxn],suf[maxn],a[maxn]; stack <int> sta; void getpre(){ ;i>=;i--){ ,sta.pop(); sta.push(i); } ,sta.pop(); } void getsuf(){ ;i<n;i++){ ,sta.pop();…

洛谷 Codeforces 我竟然能在有生之年踩标算. 思路 首先考虑暴力:枚举左右端点直接计算. 考虑记录\(sum_x=\sum_{i=1}^x c_i\),设选\([l,r]\)时那个奇怪东西的平方为\(f(l,r)\),使劲推式子: \[ ans_{l,r}=(r-l+1)\times a-sum_r+sum_{l-1}-f(l,r)\\ ans_{l,r}+l\times a-a-sum_{l-1}=r\times a-sum_r-f(l,r)\\ ans_{l,r}+l\times…

Codeforces 1107G 线段树最大子段和 + 单调栈 G. Vasya and Maximum Profit Description: Vasya got really tired of these credits (from problem F) and now wants to earn the money himself! He decided to make a contest to gain a profit. Vasya has \(n\) problems to choo…

Bike loves looking for the second maximum element in the sequence. The second maximum element in the sequence of distinct numbers x1, x2, ..., xk (k > 1) is such maximum element xj, that the following inequality holds: . The lucky number of the seque…

Mike and Feet Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 548D Appoint description:  Description Mike is the president of country What-The-Fatherland. There are n bears living in thi…

Mike is the president of country What-The-Fatherland. There are n bears living in this country besides Mike. All of them are standing in a line and they are numbered from 1 to n from left to right. i-th bear is exactly ai feet high. A group of bears…

You are given an array a consisting of n elements. The imbalance value of some subsegment of this array is the difference between the maximum and minimum element from this segment. The imbalance value of the array is the sum of imbalance valuesof all…

D. Imbalanced Array time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an array a consisting of n elements. The imbalance value of some subsegment of this array is the differenc…

2018-11-16 22:45:48 一.单调队列 Monotone Queue 239. Sliding Window Maximum 问题描述: 问题求解: 本题是一个经典的可以使用双端队列或者说单调队列完成的题目,具体来说,就是通过双端队列将可能的最大值维护起来. public int[] maxSlidingWindow(int[] nums, int k) { if (nums == null || nums.length < k || k == 0) return new int[…

题目链接:点击传送 MINSUB - Largest Submatrix no tags  You are given an matrix M (consisting of nonnegative integers) and an integer K.  For any submatrix of M' of M define min(M') to be the minimum value of all the entries of M'.  Now your task is simple:  f…