Compilare: main.cpp: In function 'int calc(std::vector<std::pair<int, bool> >&)': main.cpp:37:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (int i = 0; i < vec.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:58:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int i = 1; i < vec.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:61:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, bool> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | for (int i = 0; i < vec.size(); ++i) { | ~~^~~~~~~~~~~~