Compilare: main.cpp: In function 'bool parse_A(int&)': main.cpp:15:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | if(idx >= s.size()) return false; | ~~~~^~~~~~~~~~~ main.cpp: In function 'bool parse_B(int&)': main.cpp:24:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if(idx >= s.size()) return false; | ~~~~^~~~~~~~~~~ main.cpp:32:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(idx >= s.size() || s[idx] != 3) return false; | ~~~~^~~~~~~~~~~ main.cpp: In function 'bool parse_C(int&)': main.cpp:42:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if(idx >= s.size()) return false; | ~~~~^~~~~~~~~~~ main.cpp:55:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if(idx >= s.size() || s[idx] != 2) return false; | ~~~~^~~~~~~~~~~