#include <iostream> using namespace std; int main() { string str; cin >> str; int cnt = 0; int cnt_arr[26] = {0}; int cnt_arr_cnt[26] = {0}; for (int i = 0; i < str.size(); i++) { if (cnt_arr[str[i] - 'a'] == 1) { //当前字符是否遍历过了 continue; } else { cnt_arr[str[i] - 'a'] = 1; for (int j =...