View Compilation Error

0_0_39279392_415.cpp: In function 'int main()':
0_0_39279392_415.cpp:15:19: error: 'k' was not declared in this scope
   15 |     while (cin >> k >> s) {
      |                   ^
0_0_39279392_415.cpp:18:27: error: expected primary-expression before ';' token
   18 |         for (r = 0, l = 0,; l < s.length(); ++ l) {
      |                           ^
0_0_39279392_415.cpp:19:36: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'lenth'; did you mean 'length'?
   19 |             while (l <= r && r < s.lenth() && x[s[r]] < k) {
      |                                    ^~~~~
      |                                    length