func_code_string: #include <bits/stdc++.h>   using namespace std;   int s0, t0, t1, n, m, Next[500000 + 5];   char s[500000 + 5], t[500000 + 5];   void GetNext() {     Next[0] = -1;     int j = 0, k = -1;     while (j < m) {       if (!~k || t[j] == t[k])         Next[++j] = ++k;       else         k = Next[k];     }   }   int main() {     scanf( %s%s , s, t);     n = strlen(s), m = strlen(t);     GetNext();     for (int i = 0; s[i]; i++) s0 += s[i] ==  0 ;     for (int i = 0; t[i]; i++) t0 += t[i] ==  0 ;     for (int i = Next[m]; t[i]; i++) t1 += t[i] ==  0 ;     int A = t0, B = m - t0, l = m - Next[m], step = 0;     while (A + t1 <= s0 && B + l - t1 <= n - s0) A += t1, B += l - t1, step++;     if (t0 <= s0 && m - t0 <= n - s0) {       printf( %s , t);       for (int i = 0; i < step; i++) printf( %s , t + Next[m]);       for (int i = s0 - A; i; i--) putchar( 0 );       for (int i = n - s0 - B; i; i--) putchar( 1 );       puts(  );     } else       printf( %s n , s);     return 0;   }   