Compilare: main.cpp: In function 'void bkt(int)': main.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:57:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(OK==0) ^