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picking-numbers.js
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picking-numbers.js
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'use strict';
const fs = require('fs');
process.stdin.resume();
process.stdin.setEncoding('utf-8');
let inputString = '';
let currentLine = 0;
process.stdin.on('data', function(inputStdin) {
inputString += inputStdin;
});
process.stdin.on('end', function() {
inputString = inputString.split('\n');
main();
});
function readLine() {
return inputString[currentLine++];
}
/*
* Complete the 'pickingNumbers' function below.
*
* The function is expected to return an INTEGER.
* The function accepts INTEGER_ARRAY a as parameter.
*/
function pickingNumbers(a) {
let max = 1;
for (let i = 0; i < a.length; i++) { // first determine how many of the target number there are
let equal = 1;
for (let j = i + 1; j < a.length; j++) {
if (a[i] == a[j]) {
equal++;
}
}
let plusone = 0;
let minusone = 0;
for (let j = i + 1; j < a.length; j++) { // now determine how many +1 and -1 of the target there are
if (a[i] - a[j] == -1) {
plusone++;
}
if (a[i] - a[j] == 1) {
minusone++;
}
}
let count = Math.max(plusone, minusone) + equal // eliminate the lower frequency
if (max < count) {
max = count;
}
}
return max;
}
function main() {
const ws = fs.createWriteStream(process.env.OUTPUT_PATH);
const n = parseInt(readLine().trim(), 10);
const a = readLine().replace(/\s+$/g, '').split(' ').map(aTemp => parseInt(aTemp, 10));
const result = pickingNumbers(a);
ws.write(result + '\n');
ws.end();
}