为什么我的算法返回“-1”意味着目标值 73 不在数组中?(当明显 73 在数组中时)。[这是来自可汗学院,但没有帮助]
它应该返回数组中位置的索引,如果数组不包含 targetValue,则返回“-1”
Var doSearch = function(array, targetValue) {
var min = 0;
var max = array.length - 1;
var guess;
while(max >= min) {
guess = floor((max*1 + min*1) / 2);
if (guess === targetValue) {
return guess;
} else if (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);