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Cod sursa(job #826867)
#include <cstdio>
#include <cstring>
#define source 1
#define NMAX 50005
#define MMAX 250005
#define INF (1<<20)
using namespace std;
FILE *fin = fopen("bellmanford.in", "r");
FILE *fout = fopen("bellmanford.out", "w");
int N, M, K;
int D[NMAX];
struct list {
int u, v, cost;
} E[MMAX];
void Init() {
for(int i = 2; i <= N; ++ i) D[i] = INF;
D[source] = 0;
}
int Relax(int u, int v, int cost) {
if(D[v] > D[u] + cost) {
D[v] = D[u] + cost;
return 1;
}
return 0;
}
void BellmanFord() {
int i, j;
Init();
for(i = 1; i <= N - 1; ++ i)
for(j = 1; j <= M; ++ j)
Relax(E[j].u, E[j].v, E[j].cost);
for(j = 1; j <= M; ++ j)
if(Relax(E[j].u, E[j].v, E[j].cost)) {
fprintf(fout, "Ciclu negativ!\n");
j = K + 1;
return ;
}
for(i = 2; i <= N; ++ i)
fprintf(fout, "%d ", D[i]);
fprintf(fout, "\n");
}
void showEdges() {
for(int i = 1; i <= M; ++ i)
fprintf(fout, "%d %d %d\n", E[i].u, E[i].v, E[i].cost);
}
void readData() {
int i, j, u, v, cost;
fscanf(fin, "%d %d", &N, &M);
for(i = 1; i <= M; ++ i)
fscanf(fin, "%d %d %d", &E[i].u, &E[i].v, &E[i].cost);
}
int main() {
readData();
BellmanFord();
return 0;
}