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1058.js
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1058.js
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/*
a -> b
a -> x -> b
2-친구의 수: 2단까지만 보는 BFS로 계산 가능
*/
const INPUT_FILE = process.platform === 'linux' ? '/dev/stdin' : './input';
const [peopleCountString, ...friendsMap] = require('fs')
.readFileSync(INPUT_FILE)
.toString()
.trim()
.split('\n');
const peopleCount = Number(peopleCountString);
const isFriendMap = friendsMap.map((row) => row.split('').map((value) => value === 'Y'));
const countTwoFriends = (person) => {
const twoFriends = new Set();
const friends = [];
isFriendMap[person].forEach((isFriend, other) => {
if (isFriend) {
twoFriends.add(other);
friends.push(other);
}
});
friends.forEach((friend) => {
isFriendMap[friend].forEach((isFriend, other) => {
if (isFriend) twoFriends.add(other);
});
});
twoFriends.delete(person);
return twoFriends.size;
};
let sol = 0;
for (let person = 0; person < peopleCount; person += 1) {
const count = countTwoFriends(person);
if (sol < count) sol = count;
}
console.log(sol);