Longest Run on a Snowboard Input: standard input Output: standard output Time Limit: 5 seconds Memory Limit: 32 MB Michael likes snowboarding. That's not very surprising, since snowboarding is really great. The bad thing is that in order to gain spee…

Problem C Longest Run on a Snowboard Input: standard input Output: standard output Time Limit: 5 seconds Memory Limit: 32 MB Michael likes snowboarding. That's not very surprising, since snowboarding is really great. The bad thing is that in order to…

记忆化搜索,完事... Code /** * UVa * Problem#10285 * Accepted * Time:0ms */ #include<iostream> #include<fstream> #include<sstream> #include<algorithm> #include<cstdio> #include<cstring> #include<cstdlib> #include<cctyp…

题意:和最长滑雪路径一样, #include<iostream> #include<cstdio> #include<cstring> #include <cmath> #include<stack> #include<vector> #include<map> #include<set> #include<queue> #include<algorithm> #define mod=1…

称号:给你一个二维矩阵,找到一个点.每一个可以移动到的位置相邻的上下,求最长单调路径. 分析:贪婪,dp.搜索. 这个问题是一个小样本,我们该怎么办. 这里使用贪心算法: 首先.将全部点依照权值排序(每一个点一定被值更大的点更新): 然后,按顺序更新排序后.每一个点更新周围的点: 最后,找到最大值输出就可以. 说明:╮(╯▽╰)╭居然拍了1000+,还以为这样的方法比較快呢(数据分布啊╮(╯▽╰)╭). #include <algorithm> #include <iostream>…

思路:d[x][y]表示以(x, y)作为起点能得到的最长递减序列,转移方程d[x][y] = max(d[px][py] + 1),此处(px, py)是它的相邻位置并且该位置的值小于(x, y)处的值.可以选择把所有坐标根据值的大小升序排序,因为值较大的坐标取决于值更小的相邻坐标.   AC代码: #include<cstdio> #include<algorithm> #include<cstring> #include<utility> #inclu…

题意:在一个R*C(R, C<=100)的整数矩阵上找一条高度严格递减的最长路.起点任意,但每次只能沿着上下左右4个方向之一走一格,并且不能走出矩阵外.矩阵中的数均为0~100. 分析:dp[x][y]为从位置(x,y)出发的最长路. #pragma comment(linker, "/STACK:102400000, 102400000") #include<cstdio> #include<cstring> #include<cstdlib>…

题目传送门 /* 记忆化搜索(DP+DFS):dp[i][j] 表示第i到第j个字符,最少要加多少个括号 dp[x][x] = 1 一定要加一个括号:dp[x][y] = 0, x > y; 当s[x] 与 s[y] 匹配,则搜索 (x+1, y-1); 否则在x~y-1枚举找到相匹配的括号,更新最小值 */ #include <cstdio> #include <algorithm> #include <cmath> #include <iostream&…

  Walking on the Safe Side  Square City is a very easy place for people to walk around. The two-way streets run North-South or East-West dividing the city into regular blocks. Most street intersections are safe for pedestrians to cross. In some of th…

题目链接:uva 10581 - Partitioning for fun and profit 题目大意:给定m,n,k,将m分解成n份,然后依照每份的个数排定字典序,而且划分时要求ai−1≤ai,然后输出字典序排在k位的划分方法. 解题思路:由于有ai−1≤ai的条件.所以先记忆化搜索处理出组合情况dp[i][j][s]表示第i位为j.而且剩余的未划分数为s的总数为dp[i][j][s],然后就是枚举每一位上的值.推断序列的位置就可以. #include <cstdio> #include…