汉诺塔（Towers of Hanoi）问题

算法：
 

Procedure HANOI(n, A, B, C) [
    IF(n == 1) [
        PRINT("Move sheet " n " from " A " to " C);
    ]
    ELSE [
        HANOI(n-1, A, C, B);
        PRINT("Move sheet " n " from " A " to " C);
        HANOI(n-1, B, A, C); 
    ]    
]