Compilare: user.cpp: In function ‘int caut()’: user.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<pr.size() && pr[i]<a;++i); ^ user.cpp:25:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<pr.size() && pr[i]<a;++i); ^ user.cpp: In function ‘int main()’: user.cpp:43:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=caut();i<pr.size()-1 && pr[i+1]<=b;++i) ^ user.cpp:43:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=caut();i<pr.size()-1 && pr[i+1]<=b;++i) ^