Compilare: user.cpp: In function ‘int main()’: user.cpp:16:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d\n",&n,&m); ^ user.cpp:18:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%s\n",s); ^ user.cpp:30:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%s",s); ^ user.cpp:42:14: warning: ‘jc’ may be used uninitialized in this function [-Wmaybe-uninitialized] f[ic][jc]=1; ~~~~~~~~~^~ user.cpp:42:14: warning: ‘ic’ may be used uninitialized in this function [-Wmaybe-uninitialized]