Pagini recente » Cod sursa (job #863290) | Cod sursa (job #2365858) | Cod sursa (job #944104) | Cod sursa (job #688669) | Cod sursa (job #2298525)
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
vector<pair<int, int>> list_a[50001];
vector<pair<int, int>> q;
int cost[50001];
bool compare(pair<int, int> x, pair<int, int> y) {
return x.second > y.second;
}
int main() {
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
int n, m;
fin >> n >> m;
for(int i = 0; i < m; i++) {
int st, dr, cost;
fin >> st >> dr >> cost;
list_a[st].emplace_back(dr, cost);
//list_a[dr].emplace_back(st, cost);
}
for(int i = 0; i <= n; i++) {
cost[i] = -1;
}
int start, final;
//fin >> start >> final;
q.emplace_back(start, 0);
make_heap (q.begin(),q.end(), compare);
while(!q.empty()) {
pop_heap (q.begin(),q.end(), compare);
pair<int, int> nodc = q.back();
q.pop_back();
if(cost[nodc.first] != -1) continue;
cost[nodc.first] = nodc.second;
for(auto i: list_a[nodc.first]) {
if(cost[i.first] == -1) {
q.emplace_back(i.first, cost[nodc.first] + i.second);
push_heap (q.begin(),q.end(), compare);
}
}
}
for(int i = 2; i <= n; i++) {
if(cost[i] = -1)
fout << 0 << ' ';
else
fout << cost[i] << ' ';
}
//fout<<cost[n];
return 0;
}