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Commit 4873946

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add day-ten
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‎README.md

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- Day 7: [Cousins in Binary Tree](https://github.com/libterty/leetcode-challenge/blob/master/src/may/day-seven/index.ts) :hushed:
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- Day 8: [check Straight Line](https://github.com/libterty/leetcode-challenge/blob/master/src/may/day-eight/index.ts) :grin:
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- Day 9: [Is Perfect Square](https://github.com/libterty/leetcode-challenge/blob/master/src/may/day-nine/index.ts) :alien:
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- Day 10: [Find Town Judge](https://github.com/libterty/leetcode-challenge/blob/master/src/may/day-ten/index.ts) :alien:

‎src/may/day-ten/index.ts

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/**
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* @param {number} N
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* @param {number[][]} trust
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* @return {number}
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*/
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export const findJudge = function (N: number, trust: number[][]): number {
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// hash table for villager
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const villagerMap: Set<number> = new Set();
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// hash table for judge
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const judgeMap: Map<number, number> = new Map();
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for (let i = 0; i < trust.length; i++) {
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// current trust
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const trusted: number = trust[i][1];
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// current trust counts
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const trust_count: number = judgeMap.get(trusted);
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// record village
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villagerMap.add(trust[i][0]);
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// Save judge
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trust_count ? judgeMap.set(trusted, trust_count + 1) : judgeMap.set(trusted, 1);
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}
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for (let [key, value] of judgeMap) {
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if (value === N - 1 && !villagerMap.has(key)) {
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return key;
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}
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}
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return !trust.length ? N : -1;
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};
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const a = findJudge(3, [
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[1, 3],
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[2, 3],
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]);
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const b = findJudge(3, [
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[1, 3],
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[2, 3],
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[3, 1],
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]);
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const c = findJudge(4, [
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[1, 3],
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[1, 4],
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[2, 3],
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[2, 4],
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[4, 3],
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]);
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console.log('logs', a, b, c);

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