Compilare: user.cpp: In function ‘int main()’: user.cpp:12:18: warning: unused variable ‘p’ [-Wunused-variable] int nr,k = 0,p = 0; ^ user.cpp:13:29: 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:17:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^