Compilare: user.cpp: In function ‘int main()’: user.cpp:25:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,t,x; ^ user.cpp:26:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.cpp:29:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^