Compilare: main.cpp: In function 'int main()': main.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (int i = 0; i < s.size();) { | ~~^~~~~~~~~~ main.cpp:54:32: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 54 | } else if ('0' <= s[i] && s[i] <= '9' || s[i] == '-') { | ~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:56:67: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | while ('0' <= s[i] && s[i] <= '9' || s[i] == '-' && i < s.size()) { | ~~^~~~~~~~~~ main.cpp:56:32: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 56 | while ('0' <= s[i] && s[i] <= '9' || s[i] == '-' && i < s.size()) { | ~~~~~~~~~~~~^~~~~~~~~~~~~~