Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative…
Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative…
Given a string S and a string T, count the number of distinct subsequences of S which equals T. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the…
Given a string S and a string T, count the number of distinct subsequences of S which equals T. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the…
Distinct Subsequences Total Accepted: 38466 Total Submissions: 143567My Submissions Question Solution Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed fro…
原题地址 转化为求非重路径数问题,用动态规划求解,这种方法还挺常见的 举个例子,S="aabb",T="ab".构造如下地图("."表示空位,"^"表示起点,"$"表示终点),我们的目标就是求从起点到终点一共有多少条路径. a b a ^ . a . . b . . b . $ 对于任意一个位置,不妨设坐标为(i, j),则有:如果S[i]等于T[j],可以向下走也可以向右下走:否则只能向下走 设count…
There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a l…
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1. set…
Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a character c) Repla…
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. 解题思路: DP问题,JAV…
