Compilare: user.cpp: In function ‘int main()’: user.cpp:11:15: warning: unused variable ‘y’ [-Wunused-variable] int n, i, y, sum=0, k, l, lgth, lg; ^ user.cpp:11:31: warning: unused variable ‘lgth’ [-Wunused-variable] int n, i, y, sum=0, k, l, lgth, lg; ^~~~ user.cpp:11:37: warning: unused variable ‘lg’ [-Wunused-variable] int n, i, y, sum=0, k, l, lgth, lg; ^~ user.cpp:16:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d", &n, &k); ^ user.cpp:20:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &l); ^