蒟蒻求问神犇们

常见rte原因有哪些？

foo.cc:23:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for(int i=0; i <= str.size(); i++){
      |                      ~~^~~~~~~~~~~~~

ExitCode: 11 (Segmentation fault)

这个↑是为什么RTE？