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function xorOperation(n: number, start: number): number {    const s = start >> 1;    const e = n & start & 1;    const ret = sumXor(s - 1) ^ sumXor(s + n - 1);    return (ret << 1) | e;}
function sumXor(x: number) {    return x % 4 === 0 ? x : x % 4 === 1 ? 1 : x % 4 === 2 ? x + 1 : 0;}export default xorOperation;