foo.cc: In function 'int main()':
foo.cc:29:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<st>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |                 for(int i=0;i<nt[x].size();i++)
      |                             ~^~~~~~~~~~~~~
foo.cc:31:48: error: 'y' was not declared in this scope
   31 |                         int tl=(ti<nt[x][i].a?(y-x+k-1)/k*k+x+1:x+1),ls=nt[x][i].nxt;
      |                                                ^
foo.cc:33:32: error: 'ls' was not declared in this scope; did you mean 'l'?
   33 |                         l.push(ls);
      |                                ^~
      |                                l

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