Compilare: user.cpp: In function ‘int main()’: user.cpp:14:31: warning: unused variable ‘is’ [-Wunused-variable] int t,a,b,sol,x1,y1,x2,y2,is,js,ij,jj; ^ user.cpp:14:34: warning: unused variable ‘js’ [-Wunused-variable] int t,a,b,sol,x1,y1,x2,y2,is,js,ij,jj; ^ user.cpp:14:37: warning: unused variable ‘ij’ [-Wunused-variable] int t,a,b,sol,x1,y1,x2,y2,is,js,ij,jj; ^ user.cpp:14:40: warning: unused variable ‘jj’ [-Wunused-variable] int t,a,b,sol,x1,y1,x2,y2,is,js,ij,jj; ^ user.cpp:15:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&t); ^ user.cpp:17:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d%d%d",&a,&b,&x1,&y1,&x2,&y2); ^