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#include <iostream>
#include <vector>
#include <unordered_map>
#include <set>
#include <queue>
#include <algorithm>
using namespace std;
struct Graph {
unordered_map<int, vector<pair<int, int>>> adj; // node -> list of (neighbor, weight)
void add_edge(int u, int v, int w) {
adj[u].push_back({v, w});
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