Compilare: user.cpp: In function ‘int main()’: user.cpp:9:10: warning: unused variable ‘j’ [-Wunused-variable] int n, j, cnt = 0, l; ^ user.cpp:9:13: warning: unused variable ‘cnt’ [-Wunused-variable] int n, j, cnt = 0, l; ^ user.cpp:9:22: warning: unused variable ‘l’ [-Wunused-variable] int n, j, cnt = 0, l; ^ user.cpp:10:13: warning: unused variable ‘i’ [-Wunused-variable] long long i, k; ^