Compilare: main.cpp: In function 'int distanta(int)': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:15: warning: iteration 21003 invokes undefined behavior [-Waggressive-loop-optimizations] log[i]=log[i/2]+1; ~~~~~~^~~~~~~~~~~ main.cpp:43:14: note: within this loop for(i=2;i<=21005;i++) ~^~~~~~~