Compilare: main.cpp: In function 'int variante(std::vector<int>)': main.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= v.size(); i++) { ~~^~~~~~~~~~~ main.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < v.size(); i++) { ~~^~~~~~~~~~ main.cpp:37:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized] int k; ^