33 lines
668 B
JavaScript
33 lines
668 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
let _ = require('../utils'),
|
||
|
|
mergeSort = require('../sort/merge');
|
||
|
|
|
||
|
|
let args = _.args.numbers(),
|
||
|
|
set = args.slice(0, -1),
|
||
|
|
key = args[args.length-1];
|
||
|
|
|
||
|
|
function findPair(arr, key) {
|
||
|
|
_.debug(`findPair(arr, ${key})`);
|
||
|
|
mergeSort(arr, 0, arr.length);
|
||
|
|
|
||
|
|
let i = 0,
|
||
|
|
j = arr.length-1;
|
||
|
|
for(let x = 0, len = arr.length-1; x < len; x++) {
|
||
|
|
let sum = arr[i] + arr[j];
|
||
|
|
_.debug(`sum = (arr[${i}]=${arr[i]}) + (arr[${j}]=${arr[j]}) = ${sum}`);
|
||
|
|
|
||
|
|
if(sum === key) return true;
|
||
|
|
if(sum > key) j--;
|
||
|
|
if(sum < key) i++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(require.main === module) {
|
||
|
|
_.log(findPair(set, key));
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = findPair;
|