The solution and explanation are great.
var n = parseInt(readLine()); a = readLine().split(' ');
should be using , instead of ;. And make use of a meaning name. I would also look into making use of built-in Map in ES6.
var n = parseInt(readLine()), numbers = readLine().split(' ');
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The solution and explanation are great.
should be using , instead of ;. And make use of a meaning name. I would also look into making use of built-in Map in ES6.
`