Compilare: main.cpp: In function 'void unit(std::vector<int>, std::vector<int>, std::vector<int>&)': main.cpp:308:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 308 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:308:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 308 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:316:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 316 | while (i < a.size()) | ~~^~~~~~~~~~ main.cpp:319:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 319 | while (j < b.size()) | ~~^~~~~~~~~~ main.cpp: In function 'void intersection(std::vector<int>, std::vector<int>, std::vector<int>&)': main.cpp:329:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 329 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp:329:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 329 | while (i < a.size() && j < b.size()) | ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> ec(int&, std::vector<int>)': main.cpp:343:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 343 | while (i < s.length() && s[i] != ')') | ~~^~~~~~~~~~~~ main.cpp:359:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 359 | if (i == s.length() || s[i] == ')') | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:421:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 421 | while (i < s.length()) | ~~^~~~~~~~~~~~