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const top = 0;
const parent = i => ((i + 1) >>> 1) - 1;
const left = i => (i << 1) + 1;
const right = i => (i + 1) << 1;
let g = new Array(100005);
let vis = new Array(100005);
class PriorityQueue {
constructor(comparator = (a, b) => a[0] < b[0]) {
this._heap = [];
this._comparator = comparator;
}
size() {
return this._heap.length;
}
isEmpty() {
return this.size() == 0;
}
peek() {
return this._heap[top];
}
push(...values) {
values.forEach(value => {
this._heap.push(value);
this._siftUp();
});
return this.size();
}
pop() {
const poppedValue = this.peek();
const bottom = this.size() - 1;
if (bottom > top) {
this._swap(top, bottom);
}
this._heap.pop();
this._siftDown();
return poppedValue;
}
replace(value) {
const replacedValue = this.peek();
this._heap[top] = value;
this._siftDown();
return replacedValue;
}
_greater(i, j) {
return this._comparator(this._heap[i], this._heap[j]);
}
_swap(i, j) {
[this._heap[i], this._heap[j]] = [this._heap[j], this._heap[i]];
}
_siftUp() {
let node = this.size() - 1;
while (node > top && this._greater(node, parent(node))) {
this._swap(node, parent(node));
node = parent(node);
}
}
_siftDown() {
let node = top;
while (
(left(node) < this.size() && this._greater(left(node), node)) ||
(right(node) < this.size() && this._greater(right(node), node))
) {
let maxChild = (right(node) < this.size() && this._greater(right(node), left(node))) ? right(node) : left(node);
this._swap(node, maxChild);
node = maxChild;
}
}
}
function clean(n) {
for (let i = 0; i <= n; ++i) {
g[i] = [];
vis[i] = 0;
}
}
function make_graph(edges) {
for (let i = 0; i < edges.length; i++) {
let it = edges[i];
let x = it[0];
let y = it[1];
let w = it[2];
g[x].push([w, y]);
g[y].push([w, x]);
}
}
module.exports = {
//param A : integer
//param B : array of array of integers
//param C : integer
//return a array of integers
solve: function (n, edges, source) {
clean(n);
make_graph(edges);
let distance = new Array(n).fill(Infinity);
let q = new PriorityQueue();
distance[source] = 0;
q.push([0, source]);
while (q.size() > 0) {
let p = q.pop();
let x = p[1];
if (vis[x] == 1)
continue;
vis[x] = 1;
for (let i = 0; i < g[x].length; ++i) {
let y = g[x][i][1];
let w = g[x][i][0];
if (distance[x] + w < distance[y]) {
distance[y] = distance[x] + w;
q.push([distance[y], y]);
}
}
}
for (let i = 0; i < n; ++i) {
if (distance[i] == Infinity)
distance[i] = -1;
}
return distance;
}
};Editor is loading...