Compilare: main.cpp: In function 'int CautBin(int, int)': main.cpp:19:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r+pas<a[i].size() && a[i][r+pas]<=nr) r+=pas; ~~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:17: warning: iteration 8 invokes undefined behavior [-Waggressive-loop-optimizations] if(nrd[i]==0) ~~~~~^ main.cpp:27:19: note: within this loop for(int i=2; i<=N; i++) ~^~~