STL hay B\u1ea1ch th\u1ee7 l\u00f4 c\u0169ng ch\u00ednh l\u00e0 m\u1ed9t trong m\u1ed9t s\u1ed1 c\u00e1ch ghi l\u00f4 \u0111\u1ec1 \u0111\u1ec3 h\u1ed7 tr\u1ee3 ng\u01b0\u1eddi ghi c\u00f3 th\u1ec3 t\u00ecm ra \u0111\u01b0\u1ee3c con l\u00f4, s\u1ed1 \u0111\u1ec1 c\u00f3 kh\u1ea3 n\u0103ng tr\u00fang cao nh\u1ea5t.<\/p>\n