43 lines
662 B
JavaScript
43 lines
662 B
JavaScript
'use strict';
|
|
import _ from '../utils';
|
|
|
|
let arr = _.args.numbers();
|
|
|
|
function mergeSort(a, p, r) {
|
|
if(r - p === 1) return;
|
|
|
|
let q = Math.floor((r+p)/2);
|
|
|
|
mergeSort(a, p, q);
|
|
mergeSort(a, q, r);
|
|
merge(a, p, q, r);
|
|
}
|
|
|
|
function merge(a, p, q, r) {
|
|
let i = 0,
|
|
j = 0;
|
|
|
|
let left = a.slice(p, q),
|
|
right = a.slice(q, r);
|
|
|
|
left.push(Infinity);
|
|
right.push(Infinity);
|
|
|
|
for(let k = p; k < r; k++) {
|
|
if(left[i] <= right[j]) {
|
|
a[k] = left[i];
|
|
i++;
|
|
} else {
|
|
a[k] = right[j];
|
|
j++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (require.main === module) {
|
|
mergeSort(arr, 0, arr.length);
|
|
_.log(arr.join(' '));
|
|
}
|
|
|
|
module.exports = mergeSort;
|