Compilare: main.cpp: In function 'int f(int)': main.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for (int i = 0; i < v[n].size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type] 18 | } | ^ main.cpp:10:5: warning: infinite recursion detected [-Winfinite-recursion] 10 | int f(int n) { | ^ main.cpp:14:14: note: recursive call 14 | f(v[n][i]); | ~^~~~~~~~~