View Compilation Error

0_0_39516496_41.cpp: In function 'int main()':
0_0_39516496_41.cpp:39:22: error: 'i' was not declared in this scope
   39 |                 if(s[i]>='0'&&s[i]<='9')nx[0][s[0]-'0']=0;
      |                      ^