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Cod sursa(job #236841)
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define maxm 250002
#define maxn 66000
#define maxint 2000000000
long v[maxm][3];
long s[maxn],nr[maxn];
long min[maxn];
long arb[maxn*2];
long cine[maxn*2];
long sel[maxn];
long poz2,val2;
int cmpvec(const void *a, const void *b)
{
int *c = (int *)a;
int *d = (int *)b;
return c[0] - d[0];
}
void fa_arbore(long nod, long st, long dr)
{
arb[nod] = maxint;
cine[nod] = st;
if( st == dr) return;
fa_arbore( nod*2, st, (st+dr)>>1);
fa_arbore( nod*2+1, ((st+dr)>>1)+1, dr);
}
void add_arbore( long nod, long st, long dr)
{
if( poz2 > dr || poz2 < st ) return;
if( st == dr) {arb[nod] = val2;return;}
add_arbore( nod*2, st, ((st+dr)>>1));
add_arbore( nod*2+1, ((st+dr)>>1)+1 , dr);
arb[nod] = arb[nod*2];
cine[nod] = cine[nod*2];
if( arb[nod] > arb[nod*2+1])
{
arb[nod] = arb[nod*2+1];
cine[nod] = cine[nod*2+1];
}
}
void dijkstra(long n)
{
for( long i = 2; i <= n; ++i)
min[i] = maxint;
fa_arbore(1,1,n);
poz2 = 1;
val2 = 0;
add_arbore(1,1,n);
for( long ii = 1; ii <= n; ++ii)
{
long nod = cine[1];
long val = arb[1];
sel[nod] = 1;
if( val == maxint)
break;
min[nod] = val;
poz2 = nod;
val2 = maxint;
add_arbore( 1,1, n);
for( long i = s[nod]; i < s[nod+1]; ++i)
{
long vec = v[i][1];
if( sel[ vec ] == 1) continue;
if( min[vec] > v[i][2] + val)
{
min[vec] = v[i][2] + val;
poz2 = vec;
val2 = min[vec];
add_arbore( 1,1,n);
}
}
}
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
long n,m;
scanf("%ld %ld",&n,&m);
for( long i = 1; i <= m; ++i)
{
scanf("%ld %ld %ld",&v[i][0],&v[i][1],&v[i][2]);
nr[v[i][0]]++;
}
qsort( v+1,m,sizeof(v[0]), cmpvec);
s[0] = 1;
for( long i = 1; i<= n+1; ++i)
s[i] = s[i-1] + nr[i-1];
dijkstra(n);
for( long i = 2; i <= n; ++i)
{
if( min[i] == maxint)
printf("0 ");
else printf("%ld ",min[i]);
}
return 0;
}