ICPC-CCPC/327-d.cpp at main · SkyEyeController/ICPC-CCPC · GitHub

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#include <bits/stdc++.h>
using namespace std;
int n, m;
int getfather(vector<int> &set, int x)
{
    if (x == set[x])
        return x;
    else
        return set[x]=getfather(set, set[x]);
}
void merge(vector<int> &set,int x,int y)
{
    x=getfather(set,x);
    y=getfather(set,y);
    set[y]=x;
}
int main()
{
    cin >> n >> m;
    vector<int> set(2 * n + 1);
    for (int i = 1; i <= 2 * n; i++)
    {
        set[i] = i;
    }
    bool flag = 0;
    vector<int> a(m + 1), b(m + 1);
    for (int i = 1; i <= m; i++)
    {
        cin >> a[i];
    }
    for (int i = 1; i <= m; i++)
    {
        cin >> b[i];
    }
    for (int i = 1; i <= m; i++)
    {

        if (getfather(set,a[i]) == getfather(set,b[i]))
        {
            cout << "No" << endl;
            system("pause");
            return 0;
        }
        merge(set,a[i],b[i]+n);
        merge(set,b[i],a[i]+n);
    }
    cout << "Yes" << endl;
    system("pause");
    return 0;
}