foo.cc: In function 'int main()':
foo.cc:15:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |  for(int i=0;i<s.length();i++)
      |              ~^~~~~~~~~~~
foo.cc:17:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for(int j=0;j<t1.length();j++)
      |               ~^~~~~~~~~~~~
foo.cc:22:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |    if(flag==t1.length())
      |       ~~~~^~~~~~~~~~~~~
foo.cc:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |     for(int m=0;m<t2.length();m++)
      |                 ~^~~~~~~~~~~~
foo.cc:30:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |   for(int i=0;i<str.size();i++)
      |               ~^~~~~~~~~~~
foo.cc:11:12: warning: unused variable 'x' [-Wunused-variable]
   11 |  int cnt=0,x=0;
      |            ^

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