Compilare: main.cpp: In function 'int main()': main.cpp:42:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for(int i=0;i<mat[l].size();i++) | ~^~~~~~~~~~~~~~ main.cpp:57:11: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] 57 | cout<<f[l]; | ^