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前缀表达式：op a b 中缀表达式：a op b 后缀表达式 a b op 1、对于计算单独的后缀表达式较为简单，从左到右，遇到数字将其压入栈内，遇到操作符从栈中取出两个数进行相应操作，结果再次压入栈内。 2、对于前缀表达式的计算和后缀相似，从右到左的顺序，剩下和后缀一致 3、对于中缀表达式，我们 阅读全文
posted @ 2019-03-31 15:44
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Description The Leiden University Library has millions of books. When a student wants to borrow a certain book, he usually submits an online loan form 阅读全文
posted @ 2019-03-29 23:03
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The 15-puzzle has been around for over 100 years; even if you don't know it by that name, you've seen it. It is constructed with 15 sliding tiles, eac 阅读全文
posted @ 2019-03-28 19:22
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"Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, he told them a stor 阅读全文
posted @ 2019-03-27 19:18
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Last night, little erriyue had a horrible nightmare. He dreamed that he and his girl friend were trapped in a big maze separately. More terribly, ther 阅读全文
posted @ 2019-03-27 14:20
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After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you visited 阅读全文
posted @ 2019-03-26 20:27
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描述 Ha'nyu是来自异世界的魔女，她在漫无目的地四处漂流的时候，遇到了善良的少女Rika，从而被收留在地球上。Rika的家里有一辆飞行车。有一天飞行车的电路板突然出现了故障，导致无法启动。 电路板的整体结构是一个R行C列的网格（R,C≤500），如右图所示。每个格点都是电线的接点，每个格子都包含 阅读全文
posted @ 2019-03-25 18:13
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Description A Sudoku grid is a 16x16 grid of cells grouped in sixteen 4x4 squares, where some cells are filled with letters from A to P (the first 16 阅读全文
posted @ 2019-03-25 09:37
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Imagine you are standing inside a two-dimensional maze composed of square cells which may or may not be filled with rock. You can move north, south, e 阅读全文
posted @ 2019-03-25 08:56
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描述 给定一个N行M列的01矩阵 A，A[i][j] 与 A[k][l] 之间的曼哈顿距离定义为： dist(A[i][j],A[k][l])=|i-k|+|j-l| 输出一个N行M列的整数矩阵B，其中： B[i][j]=min(1≤x≤N,1≤y≤M,A[x][y]=1){dist(A[i][j 阅读全文
posted @ 2019-03-24 19:52
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