func_code_string: #include <bits/stdc++.h>   using namespace std;   int ls, cc;   char s[1111111], a[1111111];   int main() {     gets(s), ls = strlen(s), cc = 0, a[0] =  # ;     for (int i = 0; i < ls; ++i) {       a[++cc] = s[i];       while (cc > 1 && a[cc - 1] != a[cc]) cc -= 2;     }     for (int i = 1; i <= cc; ++i) putchar(a[i]);     return 0;   }   