Compilare: main.cpp: In function 'int main()': main.cpp:99:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (int c = 0; c < s_input.length(); c++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:100:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 100 | if (s_input[c] == ' ' || c == s_input.length() - 1) { | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:101:64: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 101 | string s_nr = s_input.substr(lc, ( (lc==0 && c == s_input.length() - 1) ? c+1 : c)); | ~~^~~~~~~~~~~~~~~~~~~~~~~