Let's suppose you have an array a, a stack s (initially empty) and an array b (also initially empty). You may perform the following operations until both a and s are empty: Take the first element of a, push it into s and remove it from a (if a is not…

https://codeforces.com/contest/1131/problem/G 题意 给你一排m个的骨牌(m<=1e7),每块之间相距1,每块高h[i],推倒代价c[i],假如\(abs(i-j)<h[i]\),那么向j方向推倒i,j也会倒,问选择任意数量骨牌向任意方向推到,使得全部骨牌都倒下的代价最小 题解 连锁反应可以用单调栈或者链表模拟 定义dp[i]为推倒a[i,m]的最小代价 对于每个i,有两种选择: 向左推:\(dp[l[i]+1]=min(dp[l[i]+1],dp[…

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…

Psychos in a Line CodeForces - 319B There are n psychos standing in a line. Each psycho is assigned a unique integer from 1 to n. At each step every psycho who has an id greater than the psycho to his right (if exists) kills his right neighbor in the…

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…

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…

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…

题意: 有一个长度为n的序列,序列有长度为1...n的连续子序列, 一个连续子序列里面最小的值称作这个子序列的子序列的strength, 要求出每种长度的连续子序列的最大的strength. 思路: 以当前位置为最小值,向两边延伸. 那我就能知道这个位置作为最小值时长度. 具体思路忘了... 给出几组数据希望能有启发? /* 10 1 2 3 4 5 4 3 2 1 6 10 100000 99999 99998 99997 99996 99995 99994 99993 99992 99991…

洛谷题目链接:CF911E Stack Sorting Codeforces题目链接:Stack Sorting 题意翻译 给你一排列的一部分,让你补全整个排列使其字典序最大并且经过一个栈调整顺序之后能够顺序输出 题目描述 Let's suppose you have an array aa , a stack ss (initially empty) and an array bb (also initially empty). You may perform the following op…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1506 题目的意思其实就是要找到一个尽可能大的矩形来完全覆盖这个矩形下的所有柱子,只能覆盖柱子,不能留空. 我们求得的面积其实就是Max{s=(right[i] - left[i] + 1)*height[i];(i>=1&&i<=n)} 每一个柱子都要尽可能向左向右延伸,使得获得最大的面积. 此时我就要用到单调栈 单调栈就是栈内元素单调递增或者单调递减的栈,单调栈只能在栈顶操作.…