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DSU.cpp
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DSU.cpp
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#include<bits/stdc++.h>
#define pf printf
#define sc scanf
#define PI 2*acos(0.0)
#define fast ios_base::sync_with_stdio(false);cin.tie(0); cout.tie(0)
#define mem(a,b) memset(a, b, sizeof(a) )
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*(b/gcd(a,b)))
#define MAX 1234567899
#define mod 1000000007
#define all(v) (v).begin(),(v).end()
#define vSort(v) sort(all(v))
#define maxSort(v) sort(all(v),greater<int>())
#define Unique(v) v.erase(unique(all(v)),v.end())
#define sqr(x) ((x)*(x))
#define qube(x) ((x)*(x)*(x))
#define deci(n) cout<<fixed<<setprecision(n)
#define sci(n) sc("%d",&(n))
#define scii(x,y) sc("%d %d",&(x),&(y))
#define scl(x) sc("%lld",&(x))
#define scll(x,y) sc("%lld %lld",&(x),&(y))
#define vi vector<int>
#define hi pf(" HI \n")
#define pp pair<int,int>
#define pb(x) push_back(x)
#define mp(x,y) make_pair(x,y)
#define F first
#define S second
#define check(n,pos) (n & (1<<(pos)))
#define biton(n,pos) (n (1<<(pos)))
#define bitoff(n,pos) (n & ~(1<<(pos)))
typedef long long int lli;
typedef unsigned long long int ulli;
int dx4[] = { 0, 0, -1, 1 } ;
int dy4[] = { -1, 1, 0, 0 } ;
bool valid( int r, int c, int x, int y )
{
if( x >= 1 && x <= r && y >= 1 && y <= c ) return 1 ;
return 0 ;
}
using namespace std;
int a[2000000];
int Size[200000];
void initialize(int n )
{
for(int i=1; i<=n; i++)
{
a[i]=i;
Size[i]=1;
}
}
int Root(int i)
{
while(a[i]!=i)
{
a[i]=a[a[i]];
i=a[i];
}
return i;
}
void Union(int x,int y)
{
int roota = Root(x);
int rootb = Root(y);
if(roota!=rootb)
{
if(Size[roota]<Size[rootb])
{
a[roota] = a[rootb];
Size[rootb]+=Size[roota];
}
else
{
a[rootb]=a[roota];
Size[roota]+=Size[rootb];
}
}
}
bool Find(int x,int y)
{
if(Root(x)==Root(y))
return true;
else
false;
}
int main ()
{
initialize(100000);
int m;
int x,y;
cin >> m;
for(int i=1; i<=m; i++)
{
cin >> x >> y;
Union(x,y);
}
for(int i=1; i<=m; i++)
{
cin >> x>> y;
bool flag= Find(x,y);
if(flag)
pf("YES\n");
else
pf("NO\n");
}
return 0;
}