test/aoj/ALDS1_11_D.test.cpp

• View this file on GitHub
• Last update: 2022-04-10 12:39:22+09:00
• Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_11_D

Depends on

• cpp_src/data_structure/DisjointSetUnion.hpp

Code

#define PROBLEM \
    "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_11_D"

#include <bits/stdc++.h>

using namespace std;

#define call_from_test
#include "../../cpp_src/data_structure/DisjointSetUnion.hpp"
#undef call_from_test

using ll = long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define ALL(c) (c).begin(), (c).end()

#ifdef LOCAL
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define dump(x) true
#endif

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "{";
    rep(i, v.size()) {
        if (i) os << ",";
        os << v[i];
    }
    os << "}";
    return os;
}

int main() {
    int n, m;
    cin >> n >> m;
    unionfind uf;
    uf.init(n);

    rep(i, m) {
        int a, b;
        cin >> a >> b;
        uf.unite(a, b);
    }
    int q;
    cin >> q;
    while (q--) {
        int a, b;
        cin >> a >> b;
        puts(uf.same(a, b) ? "yes" : "no");
    }
    return 0;
}

#line 1 "test/aoj/ALDS1_11_D.test.cpp"
#define PROBLEM \
    "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_11_D"

#include <bits/stdc++.h>

using namespace std;

#define call_from_test
#line 1 "cpp_src/data_structure/DisjointSetUnion.hpp"
class unionfind {
    vector<int> par, rank;

   public:
    void init(int n) {
        par.resize(n);
        rank.resize(n);

        for (int i = 0; i < n; i++) {
            par[i] = i;
            rank[i] = 0;
        }
    }

    unionfind() {}
    unionfind(int n) { init(n); }

    int find(int x) {
        if (par[x] == x)
            return x;
        else
            return par[x] = find(par[x]);
    }

    bool unite(int x, int y) {
        x = find(x);
        y = find(y);
        if (x == y) return false;

        if (rank[x] < rank[y])
            par[x] = y;
        else {
            par[y] = x;
            if (rank[x] == rank[y]) ++rank[x];
        }
        return true;
    }

    bool same(int x, int y) { return (find(x) == find(y)); }
};
#line 10 "test/aoj/ALDS1_11_D.test.cpp"
#undef call_from_test

using ll = long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define ALL(c) (c).begin(), (c).end()

#ifdef LOCAL
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define dump(x) true
#endif

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "{";
    rep(i, v.size()) {
        if (i) os << ",";
        os << v[i];
    }
    os << "}";
    return os;
}

int main() {
    int n, m;
    cin >> n >> m;
    unionfind uf;
    uf.init(n);

    rep(i, m) {
        int a, b;
        cin >> a >> b;
        uf.unite(a, b);
    }
    int q;
    cin >> q;
    while (q--) {
        int a, b;
        cin >> a >> b;
        puts(uf.same(a, b) ? "yes" : "no");
    }
    return 0;
}

Back to top page