Compilare: main.cpp: In function 'int compute(std::vector<int>&, std::vector<char>&)': main.cpp:24:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int i = 0; i < ops.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < ops.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int calc(int&)': main.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | while (i < s.size()) { | ~~^~~~~~~~~~