Compilare: main.cpp: In function 'int calc(int, int)': main.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec[e].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vec[0].size();i++) ~^~~~~~~~~~~~~~ main.cpp:39:17: warning: iteration 38 invokes undefined behavior [-Waggressive-loop-optimizations] if(!pm[i]) ~~~~^ main.cpp:38:18: note: within this loop for(int i=2;i<=40;i++) ~^~~~