Compilare: main.cpp: In function 'void lee(int)': main.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<node>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int i = 0; i < guards.size(); i++) { | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int j = 0; j < strlen(line); j++) { | ~~^~~~~~~~~~~~~~