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PAT甲级题解-1066. Root of AVL Tree (25)
PAT甲题题解-1121. Damn Single (25)-水题
PAT甲题题解-1130. Infix Expression (25)-中序遍历
PAT甲题题解-1038. Recover the Smallest Number (30)-排序/贪心，自定义cmp函数的强大啊！！！
PAT甲题题解-1022. Digital Library (30)-map映射+vector
PAT甲题题解-1042. Shuffling Machine (20)-模拟
PAT甲题题解-1039. Course List for Student (25)-建立映射+vector