foo.cc: In function 'int calc(int, int)':
foo.cc:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |       if(r-i+1>=dic[j].size()){
      |          ~~~~~^~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:43:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |   for(int m=0;m<s.size();m++){
      |               ~^~~~~~~~~
foo.cc:44:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for(int n=0;n<s.size();n++)
      |                     ~^~~~~~~~~
foo.cc:48:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   for(int i=0;i<s.size();++i){
      |               ~^~~~~~~~~
foo.cc:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |   scanf("%d",&m);
      |   ~~~~~^~~~~~~~~

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