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destination-city_0421.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>destination-city</title>
</head>
<body></body>
<script>
/**
* @param {string[][]} paths
* @return {string}
*/
var destCity = function (paths) {
let ht = {};
let result = "";
let arrayPaths = paths.flat();
for (let i = 0; i < arrayPaths.length; i++) {
arrayPaths[i] in ht
? delete ht[arrayPaths[i]]
: (ht[arrayPaths[i]] = i);
}
for (let key in ht) {
if (ht[key] % 2 !== 0) result = key;
}
return result;
};
//way 2
const destCity = function (paths) {
let map = new Map();
for (let [s, d] of paths) {
map.set(s, d);
map.set(d, map.get(d) || null);
}
for (let [s, d] of map) {
if (d === null) return s;
}
return null;
};
</script>
</html>