View Compilation Error

0_0_39565328_20807.cpp: In function 'void solve()':
0_0_39565328_20807.cpp:11:9: error: expected ',' or ';' before 'string'
   11 |         string nots1 = "";
      |         ^~~~~~
0_0_39565328_20807.cpp:12:27: error: 'nots1' was not declared in this scope
   12 |         for (auto x : s1) nots1 += ((x - '0') ^ 1 + '0');
      |                           ^~~~~
0_0_39565328_20807.cpp:17:34: error: 'nots1' was not declared in this scope
   17 |                 if (s2[i - 1] != nots1[i - 1]) cur2++;
      |                                  ^~~~~
0_0_39565328_20807.cpp:18:34: error: 'nots1' was not declared in this scope
   18 |                 if (s3[i - 1] != nots1[i - 1]) cur3++;
      |                                  ^~~~~