foo.cc: In function 'int main()':
foo.cc:39:48: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   39 |                 if (c[i].name.find("reioxzsj") != -1) {
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
foo.cc:40:54: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |                         while (c[i].name.find("woc") != -1) {
      |                                ~~~~~~~~~~~~~~~~~~~~~~^~~~~
foo.cc:43:43: 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 i = 0; i < c[i].name.size(); i++) {
      |                                         ~~^~~~~~~~~~~~~~~~~~
foo.cc:51:53: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |                         while (c[i].name.find("pr") != -1) {
      |                                ~~~~~~~~~~~~~~~~~~~~~^~~~~

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