97. Interleaving String Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example, Given: s1 = "aabcc", s2 = "dbbca", When s3 = "aadbbcbcac", return true. When s3 = "aadbbbaccc", retu…

引言 二维动态规划中最常见的是棋盘型二维动态规划. 即 func(i, j) 往往只和 func(i-1, j-1), func(i-1, j) 以及 func(i, j-1) 有关 这种情况下,时间复杂度 O(n*n),空间复杂度往往可以优化为O(n) 例题  1 Minimum Path Sum  Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right whi…

题意:现在要写m行代码,总共有n个文件,现在给出第i个文件每行会出现v[i]个bug,问你在bug少于b的条件下有多少种安排 分析:定义dp[i][j][k],i个文件,用了j行代码,有k个bug 状态转移为 1.在第i个文件,不写代码   dp[i][j][k]=dp[i-1][j][k] 2.在第i个文件,写代码      dp[i][j][k]+=dp[i][j-1][k-v[i]] 这题巧妙在于,既往i转移,又往j和k方向转移,这样我把它形容为二维动态规划 代码: #include <b…

题目描述与背景介绍 背景题目: [674. 最长连续递增序列]https://leetcode-cn.com/problems/longest-continuous-increasing-subsequence/ [300. 最长递增子序列]https://leetcode-cn.com/problems/longest-increasing-subsequence/ 这两个都是DP的经典题目,674比较简单. 代码: class Solution { public int findLength…

72. 编辑距离 再次验证leetcode的评判机有问题啊!同样的代码,第一次提交超时,第二次提交就通过了! 此题用动态规划解决. 这题一开始还真难到我了,琢磨半天没有思路.于是乎去了网上喵了下题解看到了动态规划4个字就赶紧回来了. 脑海中浮现了两个问题: 为什么能用动态规划呢?用动态规划怎么解? 先描述状态吧: f[i][j]表示word1中的[0,i] 与 word2中[0,j]的最少操作数. 实际上这时候就能看出来了,当一个状态计算完成时,即一个状态的操作方案(决策)确定时,不影响后面状态…

思路:a[i][j]表示j秒在i位置的数目,dp[i][j]表示j秒在i位置最大可以收到的数目. 转移方程:d[i][j]=max(dp[i-1][j],dp[i-1][j-1],dp[i-1][j+1]); #include<iostream> #include<string> #include<algorithm> #include<cstdlib> #include<cstdio> #include<set> #include&…

Palindrome Description A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to write a program which, given a string, determines the minimal number of characters to be inse…

题目: Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example,Given:s1 = "aabcc",s2 = "dbbca", When s3 = "aadbbcbcac", return true.When s3 = "aadbbbaccc", return false. 这个题目值得记录的原因除了自…

题目链接 题目要求: Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example, Given: s1 = "aabcc", s2 = "dbbca", When s3 = "aadbbcbcac", return true. When s3 = "aadbbbaccc", return false. 这道题…

题目如下:https://oj.leetcode.com/problems/interleaving-string/ Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. For example, Given: s1 = "aabcc", s2 = "dbbca", When s3 = "aadbbcbcac", return true. Whe…