()()()()()-()( )-()()()()()()()()1.2.3.()1.2.()1.2.3.()()-1.2.3.4.()6.()-()1. 2. - 3. 4. 5. pop()()1.2.3.4.5.()1.2.3.4.5.()pop ()1993101114 1999-2000-199920002002123990042002620036ab ,1212stickerpr3-175119992002-2-3112-3-/4-21233-1. 11/41/222. 50%,11.2.,34.5.6. 7.2-3-/119951999-2 3- -175,- 1-21233-1 23-1 -: 21 ?21-23-3.5 411-2
