给出N*M矩阵.每一个点建立灯塔有花费.每一个点的灯塔有连接范围,求每一行都建立一个灯塔的最小花费,要求每相邻两行的灯塔能够互相连接.满足 |j-k|≤f(i,j)+f(i+1,k) DP思路,dp[i][j]=在第i行的j位置放置灯塔的最小花费.dp[i][j]=Min(dp[i-1][k]+a[i][j]),同一时候更新当前点能够覆盖该行的全部位置的最小值 要求上个区间的最小值,用线段树优化,否则超时 滚动数组,否则超内存 #include "stdio.h" #include &…

Man Down Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2030    Accepted Submission(s): 743 Problem Description The Game “Man Down 100 floors” is an famous and interesting game.You can enjoy t…

同 HDU 2836 只不过改成了求最长子串. DP+线段树单点修改+区间查最值. #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> #define lson l, m, rt << 1 #define rson m + 1, r, rt << 1 | 1 using namespace std; ; int n, d; int v…

Attack Time Limit: 5000/3000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others)Total Submission(s): 2496    Accepted Submission(s): 788 Problem Description Today is the 10th Annual of “September 11 attacks”, the Al Qaeda is about to attack…

Coder Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4838    Accepted Submission(s): 1853 Problem Description In mathematics and computer science, an algorithm describes a set of procedures…

题目链接: http://codeforces.com/contest/834/problem/D 题意: 每个数字代表一种颜色, 一个区间的美丽度为其中颜色的种数, 给出一个有 n 个元素的数组, 问将其分成 k 个区间, 问 k 个区间的美丽度和最大为多少 . 思路: dp + 线段树区间更新, 区间最值 用 dp[i][j] 存储前 j 个元素分成 i 个区间的最大美丽度和为多少, 那么动态转移方程式为: dp[i][j] = max(dp[i - 1][k] + gel(k + 1, n…

Codeforces Round #620 F2. Animal Observation (hard version) (dp + 线段树) 题目链接 题意 给定一个nm的矩阵,每行取2k的矩阵,求总共矩阵里的数的和最大值,重复取到的数不算 题解 dp[i]表示当前行从第i个数开始取矩阵的最大值 dp[i] = 上一行中最大数 + 当前行第i个数到第i+k-1个数的和 - 当前行重复的 + 下一行第i个数到第i+k-1个数的和 用线段树维护 上一行中最大数 + 当前行第i个数到第i+k-1个数的…

http://acm.hdu.edu.cn/showproblem.php?pid=3698 Let the light guide us Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 62768/32768 K (Java/Others) Total Submission(s): 759    Accepted Submission(s): 253 Problem Description Plain of despair was…

Description Plain of despair was once an ancient battlefield where those brave spirits had rested in peace for thousands of years. Actually no one dare step into this sacred land until the rumor that “there is a huge gold mine underneath the plain” s…

Description N soldiers from the famous "*FFF* army" is standing in a line, from left to right. o o o o o o o o o o o o o o o o o o /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ /F\ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ /…