Compilare: user.cpp: In function ‘int main()’: user.cpp:43:19: warning: variable ‘i1’ set but not used [-Wunused-but-set-variable] int i,j,lun=0,i1,j1; ^ user.cpp:43:22: warning: variable ‘j1’ set but not used [-Wunused-but-set-variable] int i,j,lun=0,i1,j1; ^ user.cpp:44:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:48:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i][j]); ^