function solution(A) {
let map = {};

for (let i = 0, n = A.length; i < n; i++) {
let key = A[i];

if (!map[key]) {
map[key] = 0;
}

map[key]++;
}

for (let key in map) {
if (map[key] % 2 === 1) {
return parseInt(key);
}
}
}


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function solution(A, K) {
let arr = Array.from(A); // clone
let n = K % A.length; // for better performance

for (let i = 0; i < n; i++) {
let val = arr.pop();
arr.unshift(val);
}

return arr;
}

function solution(A, K) {
let arr = [];

for (let i = 0, j; i < A.length; i++) {
j = (i + K) % A.length;
arr[j] = A[i];
}

return arr;
}


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function fibonacci(N) {
if (N <= 2) {
return 1;
}

let a = 1; // N - 2
let b = 1; // N - 1
let result;

for (let i = 3; i <= N; i++) {
result = a + b;
a = b;
b = result;
}

return result;
}


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