Compilare: main.cpp: In function 'int back(int)': main.cpp:26:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:69:1: warning: no return statement in function returning non-void [-Wreturn-type] 69 | } | ^ main.cpp:22:5: warning: infinite recursion detected [-Winfinite-recursion] 22 | int back(int cont) | ^~~~ main.cpp:56:17: note: recursive call 56 | back(cont - 1); | ~~~~^~~~~~~~~~