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Cod sursa(job #585319)
#include<fstream>
using namespace std;
ofstream g("dfs.out");
int n,m,i,j,*a[200001],x,y,p,q,ok;
int viz[101];
void df(int x)
{
//g<<x<<" ";
viz[x]=1;
for(int i=1;i<=a[x][0];i++)
if(!viz[a[x][i]])
df(a[x][i]);
}
int main()
{
ifstream f("dfs.in");
f>>n>>m;
for(i=1;i<=n;i++)
{
a[i]=(int *) realloc (a[i],sizeof(int));
a[i][0]=0;
}
while(f>>x>>y)
{
a[x][0]++;
a[x]=(int *) realloc (a[x],(a[x][0]+1)*sizeof(int));
a[x][a[x][0]]=y;
a[y][0]++;
a[y]=(int *) realloc (a[y],(a[y][0]+1)*sizeof(int));
a[y][a[y][0]]=x;
}
ok=0;
for(j=1;j<=n;j++)
if(!viz[j])
{
ok++;
df(j);
}
g<<ok;
return 0;
}