Compilare: user.cpp: In function ‘void Fill(int, int)’: user.cpp:71:9: warning: variable ‘ux’ set but not used [-Wunused-but-set-variable] int ux=0,uy=0; ^ user.cpp:71:14: warning: variable ‘uy’ set but not used [-Wunused-but-set-variable] int ux=0,uy=0; ^ user.cpp: In function ‘int main()’: user.cpp:99:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:104:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&M[i][j]); ^