/in/foo.cc: In function 'bool solve()':
/in/foo.cc:11:17: warning: format '%d' expects a matching 'int*' argument [-Wformat=]
  scanf("%d%d",&n);
                 ^
/in/foo.cc:15:21: error: no matching function for call to 'to_string(std::__cxx11::string&)'
  else k=to_string(kk);
                     ^
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from /usr/include/c++/6/complex:45,
                 from /usr/include/c++/6/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:52,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/basic_string.h:5470:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(int)
   to_string(int __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5470:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'int'
/usr/include/c++/6/bits/basic_string.h:5475:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(unsigned int)
   to_string(unsigned __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5475:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'unsigned int'
/usr/include/c++/6/bits/basic_string.h:5481:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long int)
   to_string(long __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5481:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'long int'
/usr/include/c++/6/bits/basic_string.h:5486:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long unsigned int)
   to_string(unsigned long __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5486:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'long unsigned int'
/usr/include/c++/6/bits/basic_string.h:5492:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long long int)
   to_string(long long __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5492:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'long long int'
/usr/include/c++/6/bits/basic_string.h:5498:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long long unsigned int)
   to_string(unsigned long long __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5498:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'long long unsigned int'
/usr/include/c++/6/bits/basic_string.h:5504:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(float)
   to_string(float __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5504:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'float'
/usr/include/c++/6/bits/basic_string.h:5513:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(double)
   to_string(double __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5513:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'double'
/usr/include/c++/6/bits/basic_string.h:5522:3: note: candidate: std::__cxx11::string std::__cxx11::to_string(long double)
   to_string(long double __val)
   ^~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5522:3: note:   no known conversion for argument 1 from 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}' to 'long double'