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#include <iostream>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <set>
#include <list>
#include <string>
#include <cmath>
#include <stack>
#include <map>
#include <sstream>
#include <queue>
using namespace std;
struct road {
int target;
int cost;
};
vector<int>dist;
struct compare_road {
bool operator()(int& a, int& b) {
return dist[a] > dist[b];
}
};
int main() {
int n, m;
while (cin >> n >> m) {
if (n == 0)break;
dist.resize(n + 1);
for (int i =1; i <= n; i++) {
dist[i] = 1e9;
&nb...
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