Compilare: user.cpp: In function ‘int main()’: user.cpp:60:9: warning: unused variable ‘i’ [-Wunused-variable] int i,caz; ^ user.cpp:60:11: warning: unused variable ‘caz’ [-Wunused-variable] int i,caz; ^~~ user.cpp: In function ‘void read()’: user.cpp:41:28: 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:46:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&caz,&x,&y); ^