Main.cc: In function 'int main()':
Main.cc:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |          for(int i=0;i<str.size();i++){
      |                      ~^~~~~~~~~~~
Main.cc:15:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   15 |             if(v.size()<k){
      |                ~~~~~~~~^~
Main.cc:18:39: error: expected primary-expression before ';' token
   18 |             for(int i=0;i<=v.size()-k+;i++){
      |                                       ^