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Cod sursa(job #640918)
#include<cstdio>
#include<vector>
#include<set>
#define inf 0xfffffff
#define Check() if (++pozitie == 8192){fread (buff, 1, 8192, stdin); pozitie = 0;}
using namespace std;
struct muchie {int y, c;};
struct nod {int n, c;};
vector <muchie> muchii[50001];
vector <int> cost;
char buff[8192];
int n, m, pozitie;
void citeste(int &nr){
nr = 0;
while (buff[pozitie] < '0' || buff[pozitie] > '9') Check()
while (buff[pozitie] >= '0' && buff[pozitie] <= '9'){
nr = nr * 10 + (buff[pozitie] - '0');
Check()
}
}
struct compara{
bool operator()(nod n1, nod n2) const
{return n1.c < n2.c;}
};
multiset <nod, compara> heap;
int main(){
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
citeste(n); citeste(m);
int i, x, y, c;
for (i = 0; i < m; i++){
citeste(x); citeste(y); citeste(c);
muchii[x].push_back( (muchie){y, c} );
}
cost.assign(n+1, inf);
cost[1] = 0;
heap.insert( (nod){1, 0} );
while (!heap.empty()){
multiset<nod, compara>::iterator it = heap.begin();
int x = (*it).n;
for (i = 0 ;i < (int)muchii[x].size(); i++){
y = muchii[x][i].y;
c = muchii[x][i].c;
if (cost[y] > cost[x] + c){
cost[y] = cost[x] + c;
heap.insert( (nod){y, cost[y]} );
}
}
heap.erase(it);
}
for (i = 2; i<=n; i++) printf("%d ", cost[i] != inf ? cost[i] : 0);
return 0;
}