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week-2-lonely-integer.ts
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week-2-lonely-integer.ts
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'use strict';
import { WriteStream, createWriteStream } from "fs";
process.stdin.resume();
process.stdin.setEncoding('utf-8');
let inputString: string = '';
let inputLines: string[] = [];
let currentLine: number = 0;
process.stdin.on('data', function(inputStdin: string): void {
inputString += inputStdin;
});
process.stdin.on('end', function(): void {
inputLines = inputString.split('\n');
inputString = '';
main();
});
function readLine(): string {
return inputLines[currentLine++];
}
/*
* Complete the 'lonelyinteger' function below.
*
* The function is expected to return an INTEGER.
* The function accepts INTEGER_ARRAY a as parameter.
*/
function lonelyinteger(a: number[]): number {
const uniqueNumber = a.find((value)=> a.indexOf(value) === a.lastIndexOf(value));
return uniqueNumber;
}
function main() {
const ws: WriteStream = createWriteStream(process.env['OUTPUT_PATH']);
const n: number = parseInt(readLine().trim(), 10);
const a: number[] = readLine().replace(/\s+$/g, '').split(' ').map(aTemp => parseInt(aTemp, 10));
const result: number = lonelyinteger(a);
ws.write(result + '\n');
ws.end();
}