#866381 (C++17) No.2293 無向辺 2-SAT

• 問題: No.2293 無向辺 2-SAT
• ユーザー: ぷら
• 提出日時: 2023-05-05 22:01:14
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: WA
• 実行時間: -
• コード長: 3,231 bytes
• コンパイル時間: 2,308 ms
• コンパイル使用メモリ: 204,776 KB
• 最終ジャッジ日時: 2025-02-12 18:11:21
• ジャッジサーバーID （参考情報）: judge2 / judge2

ファイルパターン	結果
sample	AC * 3
other	AC * 14 WA * 39

ソースコード

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#include <bits/stdc++.h>
using namespace std;
constexpr int mod = 998244353;
long long modpow(long long a,long long b) {
    long long ans = 1;
    while(b) {
        if(b & 1) {
            (ans *= a) %= mod;
        }
        (a *= a) %= mod;
        b /= 2;
    }
    return ans;
}
struct UnionFind {
    vector<int> par;
    vector<int> size;
    vector<vector<int>>cld;
    UnionFind(int n) {
        par.resize(n);
        size.resize(n,1);
        cld.resize(n);
        for(int i = 0; i < n; i++) {
            par[i] = i;
            cld[i].push_back(i);
        }
    }
    int find(int x) {
        if(par[x] == x) {
            return x;
        }
        return par[x] = find(par[x]);
    }
    bool same(int x, int y) {
        return find(x) == find(y);
    }
    int consize(int x) {
        return size[find(x)];
    }
    bool unite(int x,int y) {
        x = find(x);
        y = find(y);
        if(x == y) {
            return false;
        }
        if(size[x] > size[y]) {
            swap(x,y);
        }
        par[x] = y;
        size[y] += size[x];
        return true;
    }
};
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N,Q;
    cin >> N >> Q;
    UnionFind uf(N);
    vector<int>r(N,-1);
    int cnt = N;
    bool ok = true;
    vector<int>tmp;
    for(int i = 0; i < Q; i++) {
        int f;
        cin >> f;
        if(f == 1) {
            int u,v;
            cin >> u >> v;
            u--;
            v--;
            tmp.push_back(u);
            tmp.push_back(v);
            if(!uf.same(u,v)) {
                cnt--;
                if(uf.size[u] < uf.size[v]) {
                    swap(u,v);
                }
                if(r[u] == -1) {
                    r[u] = 0;
                }
                for(int j:uf.cld[v]) {
                    r[j] = r[u];
                }
                uf.unite(u,v);
            }
            else if(r[u] != r[v]) {
                ok = false;
            }
            if(ok) {
                cout << modpow(2,cnt) << "\n";
            }
            else {
                cout << 0 << "\n";
            }
        }
        if(f == 2) {
            int u,v;
            cin >> u >> v;
            u--;
            v--;
            tmp.push_back(u);
            tmp.push_back(v);
            if(!uf.same(u,v)) {
                cnt--;
                if(uf.size[u] < uf.size[v]) {
                    swap(u,v);
                }
                if(r[u] == -1) {
                    r[u] = 0;
                }
                for(int j:uf.cld[v]) {
                    r[j] = !r[u];
                }
                uf.unite(u,v);
            }
            else if(r[u] == r[v]) {
                ok = false;
            }
            if(ok) {
                cout << modpow(2,cnt) << "\n";
            }
            else {
                cout << 0 << "\n";
            }
        }
        if(f == 3) {
            cnt = N;
            ok = true;
            for(int j:tmp) {
                uf.par[j] = j;
                uf.size[j] = 1;
                uf.cld[j].clear();
                r[j] = -1;
            }
            tmp.clear();
            cout << modpow(2,N) << "\n";
        }
    }
}
 
 
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