Compilare: user.cpp: In function ‘int uni(int, int)’: user.cpp:23:11: warning: unused variable ‘x1’ [-Wunused-variable] int r1,r2,x1,y1,c; ^ user.cpp:23:14: warning: unused variable ‘y1’ [-Wunused-variable] int r1,r2,x1,y1,c; ^ user.cpp: In function ‘int main()’: user.cpp:62:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d",&p); ^ user.cpp:67:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&w[i].x,&w[i].y); ^