Cod sursa(job #3296246)

Utilizator RaresHRares Hanganu RaresH Data 12 mai 2025 11:22:38
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.29 kb
#include <stdio.h>
#include <queue>
#include <vector>

const int MAX_N = 50'000;
const int INF = 2'000'000'000;

struct Edge {
  int node;
  int cost;
};

struct State {
  int node;
  int cost;

  bool operator<(const State &other) const {
    return cost < other.cost;
  }
};

int n;
std::vector<Edge> adj[MAX_N];
int min_cost[MAX_N];

void dijkstra(int source) {
  for(int i = 0; i < n; i++) {
    min_cost[i] = INF;
  }

  std::priority_queue<State> pq;
  min_cost[source] = 0;
  pq.push({source, 0});
  while(!pq.empty()) {
    State nd = pq.top();
    pq.pop();
    if(nd.cost == min_cost[nd.node]) {
      for(Edge &e : adj[nd.node]) {
        int c = nd.cost + e.cost;
        if(c < min_cost[e.node]) {
          min_cost[e.node] = c;
          pq.push({e.node, c});
        }
      }
    }
  }
}

int main() {
  FILE *fin = fopen("dijkstra.in", "r");
  FILE *fout = fopen("dijkstra.out", "w");

  int m;
  fscanf(fin, "%d%d", &n, &m);
  for(int i = 0; i < m; i++) {
    int u, v, cost;
    fscanf(fin, "%d%d%d", &u, &v, &cost);
    u--;
    v--;
    adj[u].push_back({v, cost});
  }

  dijkstra(0);

  for(int i = 1; i < n; i++) {
    fprintf(fout, "%d ", min_cost[i]);
  }
  fputc('\n', fout);

  fclose(fin);
  fclose(fout);

  return 0;
}