Compilare: user.cpp: In function ‘int main()’: user.cpp:28:17: warning: unused variable ‘nr’ [-Wunused-variable] int n,k,i,t,nr,j; ^~ user.cpp:29:30: 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:31:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&cf[i]); ^