使用while语句进行二进制搜索

时间:2016-10-31 12:06:54

标签: javascript while-loop binary-search

我几乎不好意思问这个问题,但无论出于何种原因我都无法让这个问题起作用。它是可汗学院关于二元搜索的练习。 https://www.khanacademy.org/computing/computer-science/algorithms/binary-search/p/challenge-binary-search

任何帮助将不胜感激!谢谢!

编辑:我应该编辑一下,说我从Khan Academy获得的错误消息是"看起来你在while循环中几乎有正确的条件,但是它仍然有问题"它没有太大的帮助。



/* Returns either the index of the location in the array,
  or -1 if the array did not contain the targetValue */
var doSearch = function(array, targetValue) {
	var min = 0;
	var max = array.length - 1;
    var guess;
    while(max > min) {
        guess = Math.floor((max+min)/2);
        if(array[guess] === targetValue) {
            return guess;
        } else if (array[guess] < targetValue) {
            min = guess + 1;
        } else {
            max = guess - 1;
        }
    }
	return -1;
};

var primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 
		41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97];

var result = doSearch(primes, 73);
println("Found prime at index " + result);

Program.assertEqual(doSearch(primes, 73), 20);
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1 个答案:

答案 0 :(得分:4)

改变这个:

while(max > min)

while(max >= min)