c++ java python class Solution { public: /** * longest common subsequence * @param s1 string字符串 the string * @param s2 string字符串 the string * @return string字符串 */ string LCS(string s1, string s2) { // write code here int m = s1.size(); int n = s2.size(); int max_len = 0; int pos = 0; string ma...