Compilare: user.cpp: In function ‘void update(int, int, int)’: user.cpp:32:9: warning: unused variable ‘i’ [-Wunused-variable] int i,m=(l+r)/2,f1=nod*2,f2=nod*2+1; ^ user.cpp: In function ‘int main()’: user.cpp:59:11: warning: unused variable ‘a’ [-Wunused-variable] int i,a,b,c; ^ user.cpp:59:13: warning: unused variable ‘b’ [-Wunused-variable] int i,a,b,c; ^ user.cpp:59:15: warning: unused variable ‘c’ [-Wunused-variable] int i,a,b,c; ^ user.cpp: In function ‘void build()’: user.cpp:51:45: warning: ‘f1’ may be used uninitialized in this function [-Wmaybe-uninitialized] arb[i].st=max(arb[f1].st,arb[f1].all+arb[f2].st); ^ user.cpp:51:45: warning: ‘f2’ may be used uninitialized in this function [-Wmaybe-uninitialized]