Compilare: user.cpp: In function ‘int main()’: user.cpp:8:15: warning: unused variable ‘k’ [-Wunused-variable] int n, m, k=0; ^ user.cpp:15:9: warning: unused variable ‘len’ [-Wunused-variable] int len=0, i=1, j, q=0; ^ user.cpp:15:24: warning: unused variable ‘q’ [-Wunused-variable] int len=0, i=1, j, q=0; ^