Compilare: user.cpp: In function ‘int main()’: user.cpp:30:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (right<n[j].b) ^ user.cpp:18:20: warning: unused variable ‘a’ [-Wunused-variable] int t,i,m,nr,j,a,b,k,left,right; ^ user.cpp:18:22: warning: unused variable ‘b’ [-Wunused-variable] int t,i,m,nr,j,a,b,k,left,right; ^ user.cpp:18:24: warning: unused variable ‘k’ [-Wunused-variable] int t,i,m,nr,j,a,b,k,left,right; ^