Compilare: user.cpp: In function ‘void torol(int)’: user.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p*2<x.size() && x[p*2].a<x[poz].a) poz=p*2; ^ user.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p*2+1<x.size() && x[p*2+1].a<x[poz].a) poz=p*2+1; ^ user.cpp: In function ‘int main()’: user.cpp:56:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,a,b; ^