Compilare: user.cpp: In function ‘int solve()’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(OK==true && sol<a[1].size()) ~~~^~~~~~~~~~~~ user.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(step<a[s[i]-'a'+1].size()-1) ~~~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz+step<=a[s[i]-'a'+1].size()-1 && a[i][poz+step]<=p) ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[s[i]-'a'+1].size()<sol+poz+1)ok=false; ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~