Compilare: main.cpp: In function 'bool e_convex(std::vector<punct>&)': main.cpp:43:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(ll i = 2; i < v.size(); i++){ | ~~^~~~~~~~~~ main.cpp: In function 'bool e_minim(std::string&, std::string&)': main.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for(int i = 0; i < a.size(); i++){ | ~~^~~~~~~~~~ main.cpp: In function 'void gas_start(std::vector<punct>&)': main.cpp:59:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int i = 0; i < v.size(); i++){ | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:114:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | for(ll k = 0; k + 1 < st.size(); k++){ | ~~~~~~^~~~~~~~~~~ main.cpp:120:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | for(ll k = 0; k + 1 < dr.size(); k++){ | ~~~~~~^~~~~~~~~~~ main.cpp:134:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 134 | for(ll k = 0; k < st.size(); k++) s[ st[k].idx ] = 'I'; | ~~^~~~~~~~~~~ main.cpp:135:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<punct>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 135 | for(ll k = 0; k < dr.size(); k++) s[ dr[k].idx ] = 'V'; | ~~^~~~~~~~~~~