Compilare: user.cpp: In function ‘int main()’: user.cpp:20:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d",&n,&m); ^ user.cpp:21:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c",&ch); ^ user.cpp:28:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c",&ch); ^ user.cpp:40:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c",&ch); ^ user.cpp:70:39: warning: ‘fy’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(b[lc][cc]==0 && (lc!=fx || cc!=fy)) { ^ user.cpp:70:29: warning: ‘fx’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(b[lc][cc]==0 && (lc!=fx || cc!=fy)) { ^ user.cpp:58:14: warning: ‘iy’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[ix][iy]=0; ^ user.cpp:58:14: warning: ‘ix’ may be used uninitialized in this function [-Wmaybe-uninitialized]