Pagini recente » Cod sursa (job #696069) | Cod sursa (job #573090) | Cod sursa (job #2008482) | Cod sursa (job #493876) | Cod sursa (job #2425259)
#include <bits/stdc++.h>
#define int_pair std::pair <int, int>
#define MAXN 50005
#define INF 1000000005
int N, M;
std::vector <int_pair> ADC[MAXN];
inline void AddEdge(int X, int Y, int W) {
ADC[X].push_back({Y, W});
}
int Dist[MAXN], Times[MAXN];
std::queue <int> Queue;
bool InQueue[MAXN];
bool BellmanFord(int Source = 1) {
for (int i=1; i<=N; ++i)
Dist[i] = INF;
Dist[Source] = 0;
int Front;
Queue.push(Source);
while (!Queue.empty()) {
Front = Queue.front();
Queue.pop();
InQueue[Front] = 0;
++ Times[Front];
if (Times[Front] == N) return false;
for (auto Edge:ADC[Front])
if (Dist[Edge.first] > Dist[Front] + Edge.second) {
Dist[Edge.first] = Dist[Front] + Edge.second;
if (!InQueue[Edge.first])
InQueue[Edge.first] = true, Queue.push(Edge.first);
}
} return true;
}
std::ifstream In ("bellmanford.in");
std::ofstream Out("bellmanford.out");
void Citire() {
In >> N >> M;
for (int i=1, X, Y, W; i<=M; ++i)
In >> X >> Y >> W, AddEdge(X, Y, W);
}
void Rezolvare() {
if (BellmanFord()) {
for (int i=2; i<=N; ++i, Out << ' ')
Out << Dist[i];
} else Out << "Ciclu negativ!\n";
}
int main()
{
Citire();
Rezolvare();
return 0;
}