Compilare: user.cpp: In function ‘int main()’: user.cpp:40:9: warning: unused variable ‘j’ [-Wunused-variable] { int i,j; ^ user.cpp:41:17: warning: unused variable ‘h’ [-Wunused-variable] FILE *f,*g,*h; ^ user.cpp:45:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:47:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d",&x); ^ user.cpp:69:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d %d",&x,&y); ^