Compilare: main.cpp: In function 'void replace(std::string&, std::string&, std::string&)': main.cpp:89:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 89 | for (i = 0; i <= s.size() - what.size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:92:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 92 | for (j = 0; j < what.size(); ++j) | ~~^~~~~~~~~~~~~ main.cpp: In function 'bool termen()': main.cpp:46:15: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] 46 | return !ans; | ^~~