Compilare: main.cpp: In function 'int main()': main.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void lg()': main.cpp:18:18: warning: iteration 29999 invokes undefined behavior [-Waggressive-loop-optimizations] if(!lg2[i]) lg2[i] = lg2[i-1]; ~~~~~^ main.cpp:17:22: note: within this loop for(int i = 1; i <= 30000; i++) ~~^~~~~~~~