JavaScript uses pointer manipulation to implement a Josephson problem instance

Source: Internet
Author: User
Tags prev reset

Before implementation of course to write some of the JS array of the internal pointer operation function, it's like: Reset (), current (), Next (), Prev (), search (), end () These functions, we all have to come to our own implementation, because JS does not have built-in these magical operation functions

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26-27--28 29---30 31--32 33 34 35 36 37 38-39 40 41 42 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 5 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104-105 Array.prototype.pointer = 0;//analog array internal pointer//reset function, the array internal pointer (point to the first element) var Reset = function (arrayobj) {if (!) ( Arrayobj instanceof Array)} {alert ("Reset () function argument type is wrong!) Please check the input! "); Return } arrayobj.pointer = 0; The//current function, which returns the current element of the array's internal pointer to the var. = function (arrayobj) {if (! Arrayobj instanceof Array)} {alert ("current () function argument type is wrong!) Please check the input! "); Return return Arrayobj[arrayobj.pointer]; //end function, point the array internal pointer to the last element var end = function (arrayobj) {if (!) ( Arrayobj instanceof Array)} {alert ("End () function argument type is wrong!) Please check the input! "); Return } arrayobj.pointer = arrayobj.length-1; return Arrayobj[arrayobj.pointer]; //next function, move the inner pointer of an array down one bit////////////////////If the last element is already pointed, FALSE var Next = function (arrayobj) {if (!) Arrayobj instanceof Array)} {alert ("Next () function argument type is wrong!") Please check the input! "); Return } Arrayobj.pointer + +; if (typeof arrayobj[arrayobj.pointer] = = ' undefined ') {arrayobj.pointer-; return false;} return true; //prev function to move the inner pointer of an array//////////If you have pointed to the first element, return FALSE var Prev = function (arrayobj) {if (!) ( Arrayobj instanceof Array)) {alert ("Prev () function parameterNumber Type Error! Please check the input! "); Return } Arrayobj.pointer--; if (typeof arrayobj[arrayobj.pointer] = = ' undefined ') {arrayobj.pointer + +; return false;} return arrayobj[ Arrayobj.pointer]; The//unset function deletes the specified array element var Unset = function (index, arrayobj) {if (!) ( Arrayobj instanceof Array)) {alert ("Unset () function argument type is wrong!) Please check the input! "); Return } if (typeof arrayobj[index] = = ' undefined ') {alert ("Unset () function parameter index error!") This element is not present! "); return false; } arrayobj.splice (index, 1); return true; The//search function returns the key name of an array via array key value var Search = function (value, arrayobj) {if (!) ( Arrayobj instanceof Array)} {alert ("Search () function argument type is wrong!") Please check the input! "); Return For (index in arrayobj) {if (arrayobj[index] = = value) {return index}}, return false; //getkingmonkey function, our Joseph main function, n monkeys, count to M function Getkingmonkey (n, m) {a = new Array (); for (i = 1; I <= n; i + +) {A[i] = i; } A[0] = 0;unset (0, a); reset (a); while (A.length > 1) {for (counter = 1; counter <= m counter + +) {if (next (a)) {if (counter = m) {unset (prev (a) , a), a); }else{Reset (a); if (Counter = = m) {unset (Search (End (a), a), a); reset (a);}} } Return to current (a); Alert ("Monkey King's number is:" + getkingmonkey (100, 17));
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