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Cod sursa(job #850117)
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <cassert>
using namespace std;
#define PRO "ciur"
void OpenFiles(int EVAL)
{
if(EVAL)
{
char input[100] = PRO, output[100] = PRO;
freopen(strcat(input, ".in"),"r",stdin);
freopen(strcat(output,".out"),"w",stdout);
} else
{
freopen("test.in","r",stdin);
freopen("test.out","w",stdout);
}
}
#define MAX 50001
#define INF 0xffffff
vector<pair<int,int> >g[MAX];
struct DHeap{ int x,c; }h[MAX];
int n,k,dist[MAX],pos[MAX];
void Push(int x,int c)
{
int t,f;
if(pos[x]==0)
{
f=++k;
h[f].x=x;
h[f].c=c;
pos[x]=f;
} else
{
f=pos[x];
h[f].c=c;
}
t=f/2;
while(t>0 && h[f].c<h[t].c)
{
swap(h[t],h[f]);
swap(pos[h[t].x],pos[h[f].x]);
f=t; t=f/2;
}
}
void Pop()
{
int t,f;
h[1]=h[k--];
pos[h[1].x]=1;
t=1;
f=2;
if(f+1<=k && h[f+1].c<h[f].c)f++;
while(f<=k && h[f].c<h[t].c)
{
swap(h[t],h[f]);
swap(pos[h[t].x],pos[h[f].x]);
t=f;
f=2*t;
if(f+1<=k && h[f+1].c<h[f].c)f++;
}
}
void Dijkstra()
{
int x,c;
for(int i=2;i<=n;i++) dist[i]=INF;
k=1;
h[1].x=1;
h[1].c=0;
while(k>0)
{
x=h[1].x;
c=h[1].c;
Pop();
for(int i=0;i<g[x].size();i++)
if(dist[g[x][i].first] > c + g[x][i].second)
{
dist[g[x][i].first]=c+g[x][i].second;
Push(g[x][i].first,dist[g[x][i].first]);
}
}
}
int main(int argv,char *args[])
{
OpenFiles(argv==0);
// start
int m,x,y,c;
scanf("%d %d",&n,&m);
for(int i=1;i<=m;i++)
{
scanf("%d %d %d",&x,&y,&c);
g[x].push_back(make_pair(y,c));
}
Dijkstra();
for(int i=2;i<=n;i++)printf("%d ",dist[i]==INF?0:dist[i]);
return 0;
}