Compilare: main.cpp: In function 'int main()': main.cpp:32:13: warning: unused variable 'k' [-Wunused-variable] int k=0; ^ main.cpp:20:17: warning: unused variable 'a' [-Wunused-variable] int n,x,l,i,a,b,ans=0,j,k; ^ main.cpp:20:19: warning: unused variable 'b' [-Wunused-variable] int n,x,l,i,a,b,ans=0,j,k; ^ main.cpp:20:27: warning: unused variable 'j' [-Wunused-variable] int n,x,l,i,a,b,ans=0,j,k; ^ main.cpp:20:29: warning: unused variable 'k' [-Wunused-variable] int n,x,l,i,a,b,ans=0,j,k; ^ main.cpp:27:15: warning: unused variable 'sans' [-Wunused-variable] long long sans=0; ^~~~