View Compilation Error

0_0_32037751_13271.cpp:10:8: error: conflicting declaration 'std::string s'
 string s;
        ^
0_0_32037751_13271.cpp:8:6: note: previous declaration as 'char s [220020]'
 char s[maxn],t[maxn];
      ^
0_0_32037751_13271.cpp: In function 'int main()':
0_0_32037751_13271.cpp:19:10: error: request for member 'size' in 's', which is of non-class type 'char [220020]'
 int ss=s.size();
          ^