memory

function solve(input) {

const numbers = input

.shift()

.trim()

.split(' ');



let moves = 0;



while (numbers.length > 1 && input[0].toLowerCase() !== 'end') {

let [index1, index2] = input

.shift()

.split(' ');

index1 = Number(index1);

index2 = Number(index2);



moves++;



if (index1 < 0

|| index1 >= numbers.length

|| index1 === index2

|| index2 < 0

|| index2 >= numbers.length) {

const index = Math.trunc(numbers.length / 2);

const symbol = '-' + moves + 'a';

numbers.splice(index, 0, symbol, symbol);

console.log('Invalid input! Adding additional elements to the board')

}

else {

const num1 = numbers[index1];

const num2 = numbers[index2];

if (num1 === num2) {

numbers.splice(index1, 1);

index2 = numbers.indexOf(num2);

numbers.splice(index2, 1);

console.log(`Congrats! You have found matching elements - ${num1}!`);

} else if (num1 !== num2) {

console.log('Try again!');

}

}

}



if (numbers.length === 0 || numbers.length === 1) {

console.log(`You have won in ${moves} turns!`);

} else {

console.log(`Sorry you lose :(`);

console.log(`${numbers.join(' ')}`);

}

}