Compilare: user.cpp: In function ‘void WriteData()’: user.cpp:66:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (L(i,j) > M) ^ user.cpp: In function ‘void ReadData()’: user.cpp:20:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.cpp:23:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &H(i,j)); ^ user.cpp: In function ‘void WriteData()’: user.cpp:80:46: warning: ‘Y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (F[X][Y] & Left) { if (L(X,Y) == L(X,Y-1)+1) { Y--; continue; } } ^ user.cpp:78:36: warning: ‘X’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (F[X][Y] & Down) { if (L(X,Y) == L(X+1,Y)+1) { X++; continue; } } ^