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Cod sursa(job #186626)
#include <cstdio>
#include <vector>
#include <set>
using namespace std;
const int N = 50000;
const int INF = 0x3f3f3f3f;
int n,m;
vector< pair<int,int> > g[N];
int d[N];
class dist_cmp {
public:
bool operator() ( int a, int b ) { return d[a] < d[b]; };
};
void dijkstra() {
set<int, dist_cmp> s;
d[0] = 0;
for (int i = 1; i < n; ++i) d[i] = INF;
for (s.insert(0); !s.empty(); s.erase(s.begin())) {
for (vector< pair<int, int> >::iterator nx = g[*s.begin()].begin(); nx != g[*s.begin()].end(); ++nx) {
int nd = d[*s.begin()] + nx->second;
if (d[nx->first] > nd) {
if (d[nx->first] != INF) s.erase(s.find(nx->first));
d[nx->first] = nd;
s.insert(nx->first);
}
}
}
}
int main() {
freopen("dijkstra.in","rt",stdin);
freopen("dijkstra.out","wt",stdout);
scanf("%d %d",&n,&m);
for (int i = 0; i < m; ++i) {
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
--a; --b;
g[a].push_back(make_pair(b,c));
}
dijkstra();
for (int i = 1; i < n; ++i) printf("%d ",(d[i] == INF) ? 0 : d[i]);
printf("\n");
return 0;
}