Compilare: user.cpp: In function ‘int main()’: user.cpp:83:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:83:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:83:13: warning: unused variable ‘x’ [-Wunused-variable] int i,j,x,y; ^ user.cpp:83:15: warning: unused variable ‘y’ [-Wunused-variable] int i,j,x,y; ^ user.cpp: In function ‘void read()’: user.cpp:23:28: 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:25:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&v[i].n1,&v[i].n2,&v[i].c); ^