View Compilation Error

0_0_39394630_24481.cpp: In function 'int main()':
0_0_39394630_24481.cpp:28:25: error: 's' was not declared in this scope
   28 |                     if (s[k].find(sub) == string::npos && s[k].find(reversedSub) == string::npos) {
      |                         ^