Compilare: user.cpp: In function ‘int main()’: user.cpp:33:9: warning: unused variable ‘x’ [-Wunused-variable] int x, y, c; ^ user.cpp:33:12: warning: unused variable ‘y’ [-Wunused-variable] int x, y, c; ^ user.cpp:33:15: warning: unused variable ‘c’ [-Wunused-variable] int x, y, c; ^ user.cpp:34:28: 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:37:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&l[i].x,&l[i].y,&l[i].c); ^