Pagini recente » Cod sursa (job #663124) | Cod sursa (job #3145976) | Cod sursa (job #2578409) | Cod sursa (job #7760) | Cod sursa (job #735772)
Cod sursa(job #735772)
#include <cstdio>
#include <cstring>
#include <vector>
#include <set>
using namespace std;
#define INF 0x3f3f3f3f
#define MAXN 50010
int d[MAXN];
struct Node {
int dest, cost;
Node *next;
};
struct comp {
bool operator()(const int &a, const int &b)const{
return d[a] < d[b];
}
};
int main(){
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
int N, M, i, s, min;
Node *graph[MAXN], *aux;
bool use[MAXN];
scanf("%d%d", &N, &M);
memset(graph, NULL, sizeof(graph));
for(i = 0; i < M; i++){
aux = new Node;
scanf("%d%d%d", &s, &aux->dest, &aux->cost);
aux->next = graph[s];
graph[s] = aux;
}
set<int, comp> Q;
memset(d, INF, sizeof(d));
memset(use, 0, sizeof(use));
Q.insert(1); d[1] = 0; use[1] = 1;
while(!Q.empty()){
set<int, comp>::iterator it = Q.begin();
min = *it;
Q.erase(it);
use[min] = 0;
for(aux=graph[min]; aux; aux=aux->next){
if(d[min]+aux->cost < d[aux->dest]){
d[aux->dest] = d[min]+aux->cost;
if(!use[aux->dest]){
Q.insert(aux->dest);
use[aux->dest]=1;
}
}
}
}
for(i = 2; i <= N; i++)
printf("%d ", (d[i]==INF)? 0: d[i]);
printf("\n");
return 0;
}