#include <iostream> #include <vector> #include <algorithm> using namespace std; string add(string &a1, string &a2) { int len1 = a1.size(); int len2 = a2.size(); int shi_len1=0, shi_len2=0, xiao_len1=0, xiao_len2=0; int i = len1-1; while (a1[i] != '.') { xiao_len1++...