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non-divisible-subset.js
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non-divisible-subset.js
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process.stdin.resume();
process.stdin.setEncoding('ascii');
var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;
process.stdin.on('data', function (data) {
input_stdin += data;
});
process.stdin.on('end', function () {
input_stdin_array = input_stdin.split("\n");
main();
});
function readLine() {
return input_stdin_array[input_currentline++];
}
/////////////// ignore above this line ////////////////////
function nonDivisibleSubset(k, arr) {
// Complete this function
let count = new Array(k).fill(0);
arr = arr.map((a) => {
const mod = a % k;
count[mod]++;
return mod;
});
let result = count[0] > 0 ? 1 : 0;
if (k % 2 == 0 && count[Math.floor(k / 2)] > 0) result++;
for (let i = 1; i < k / 2; i++) {
result += Math.max(count[i], count[k - i])
}
return result;
}
function main() {
var n_temp = readLine().split(' ');
var n = parseInt(n_temp[0]);
var k = parseInt(n_temp[1]);
arr = readLine().split(' ');
arr = arr.map(Number);
var result = nonDivisibleSubset(k, arr);
process.stdout.write("" + result + "\n");
}