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- #include <iostream>
- #include <string>
- void fastIO() {
- std::ios_base::sync_with_stdio(false);
- std::cin.tie(0);
- std::cout.tie(0);
- }
- int main() {
- fastIO();
- std::string str;
- std::cin >> str;
- std::string encodeStr(str.size() - 1, ' ');
- for (int i = 0; i < str.size() - 1; i++) {
- if (!(i % 2)) {
- encodeStr[i / 2] = str[i];
- } else {
- encodeStr[encodeStr.size() - i / 2 - 1] = str[i];
- }
- }
- std::cout << encodeStr;
- return 0;
- }
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