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function missingNumbers(arr, brr) { const missing = []; const frequencyArr = Array.from({ length: Math.max(...brr) + 1, }).fill(0); const frequencyBrr = [...frequencyArr]; for (let i = 0; i < brr.length; i++) { if (arr[i]) frequencyArr[arr[i]]++; frequencyBrr[brr[i]]++; } for (let i = 0; i < frequencyBrr.length; i++) { if (frequencyArr[i] !== frequencyBrr[i]) missing.push(i); } return missing; }
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Missing Numbers
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JavaScript Solution