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function freqQuery(queries) { const count = [] const resultMap = new Map() queries.forEach(([operation, value]) => { switch (operation) { case 1: { return resultMap.set(value, (resultMap.get(value) || 0) + 1) } case 2: { return resultMap.get(value) && resultMap.set(value, resultMap.get(value) - 1) } case 3: { const values = [...resultMap.values()]; if (values.indexOf(value) > -1) { count.push(1); } else { count.push(0); } } } }) return count }
Frequency Queries
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my JS solution