Compilare: user.cpp: In function ‘int pickrand(int, int)’: user.cpp:11:139: warning: operation on ‘z[j]’ may be undefined [-Wsequence-point] int z[3],i,j; for(i=0;i<3;++i)z[i]=rand()%(p-q)+p+1; for(i=0;i<2;++i)for(j=i+1;j<3;++j)if(v[z[i]]>v[z[j]])z[i]=(z[i]+z[j])-(z[j]=z[i]); ^ user.cpp: In function ‘void sortsort(int, int)’: user.cpp:24:49: warning: operation on ‘v[j]’ may be undefined [-Wsequence-point] if(i<j) v[i]=(v[i]+v[j])-(v[j]=v[i]); ^