Compilare: user.cpp: In function ‘int main()’: user.cpp:61:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,c,x,y,total=0; ^ user.cpp:62:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ user.cpp:65:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&x,&y,&c); ^