Compilare: main.cpp: In function 'void get_parenthesis_expressions(std::string)': main.cpp:9:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for(int i=start;i<str.length();i++){ | ~^~~~~~~~~~~~~ main.cpp:16:16: warning: comparison of integer expressions of different signedness: 'int' and 'const std::__cxx11::basic_string<char>::size_type' {aka 'const long unsigned int'} [-Wsign-compare] 16 | while(start!=string::npos && End!=-1){ | ~~~~~^~~~~~~~~~~~~~ main.cpp:23:26: 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=start;i<str.length();i++){ | ~^~~~~~~~~~~~~ main.cpp: In function 'std::string strip(std::string)': main.cpp:35:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i =0;i<str.length();i++){ | ~^~~~~~~~~~~~~ main.cpp: In function 'int ca(std::string)': main.cpp:70:20: warning: comparison of integer expressions of different signedness: 'int' and 'const std::__cxx11::basic_string<char>::size_type' {aka 'const long unsigned int'} [-Wsign-compare] 70 | if(imul_pos!=string::npos){ | ~~~~~~~~^~~~~~~~~~~~~~ main.cpp:102:19: warning: comparison of integer expressions of different signedness: 'int' and 'const std::__cxx11::basic_string<char>::size_type' {aka 'const long unsigned int'} [-Wsign-compare] 102 | if(div_pos!=string::npos){ | ~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:145:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 145 | for(int i =0;i<v.size();i++){ | ~^~~~~~~~~