Compilare: user.cpp: In function ‘void df(int)’: user.cpp:8:11: warning: unused variable ‘t1’ [-Wunused-variable] { int t,t1,t2; ^ user.cpp:8:14: warning: unused variable ‘t2’ [-Wunused-variable] { int t,t1,t2; ^ user.cpp: In function ‘int main()’: user.cpp:31:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:33:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d",&s[i]); ^ user.cpp:39:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^