Compilare: user.cpp: In function ‘char next()’: user.cpp:20:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF, fin), pos = 0; ^ user.cpp: In function ‘void order1()’: user.cpp:74:11: warning: ‘bst.build::l1’ may be used uninitialized in this function [-Wmaybe-uninitialized] build bst; ^ user.cpp:74:11: warning: ‘bst.build::l2’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:84:125: warning: ‘bst.build::c2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(mod(clad[i].l1 - clad[i].l2) + 1 < mod(bst.l1 - bst.l2) && mod(clad[i].c1 - clad[i].c2) + 1 < mod(bst.c1 - bst.c2)) ^ user.cpp:84:125: warning: ‘bst.build::c1’ may be used uninitialized in this function [-Wmaybe-uninitialized]