結果
問題 | No.2293 無向辺 2-SAT |
ユーザー |
|
提出日時 | 2023-05-05 22:09:21 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 4,532 bytes |
コンパイル時間 | 2,155 ms |
コンパイル使用メモリ | 206,100 KB |
最終ジャッジ日時 | 2025-02-12 18:21:11 |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 13 WA * 40 |
ソースコード
#include<bits/stdc++.h>using namespace std;//#pragma GCC optimize("Ofast")#define rep(i,n) for(ll i=0;i<n;i++)#define repl(i,l,r) for(ll i=(l);i<(r);i++)#define per(i,n) for(ll i=(n)-1;i>=0;i--)#define perl(i,r,l) for(ll i=r-1;i>=l;i--)#define fi first#define se second#define pb push_back#define ins insert#define pqueue(x) priority_queue<x,vector<x>,greater<x>>#define all(x) (x).begin(),(x).end()#define CST(x) cout<<fixed<<setprecision(x)#define rev(x) reverse(x);using ll=long long;using vl=vector<ll>;using vvl=vector<vector<ll>>;using pl=pair<ll,ll>;using vpl=vector<pl>;using vvpl=vector<vpl>;const ll MOD=1000000007;const ll MOD9=998244353;const int inf=1e9+10;const ll INF=4e18;const ll dy[8]={1,0,-1,0,1,1,-1,-1};const ll dx[8]={0,1,0,-1,1,-1,1,-1};template <typename T> inline bool chmax(T &a, T b) {return ((a < b) ? (a = b, true) : (false));}template <typename T> inline bool chmin(T &a, T b) {return ((a > b) ? (a = b, true) : (false));}struct UnionFindUndo {vector<int> par;stack<pair<int,int>> history;UnionFindUndo(int n) : par(n, -1) {}int root(int x) {if (par[x] < 0) return x;else return root(par[x]);}bool same(int x, int y) {return root(x) == root(y);}bool merge(int x, int y) {x = root(x); y = root(y);history.emplace(x,par[x]);history.emplace(y,par[y]);if (x == y) {return false;}if (par[x] > par[y]) swap(x, y);par[x] += par[y];par[y] = x;return true;}int size(int x) {return -par[root(x)];}void undo(){par[history.top().first]=history.top().second;history.pop();par[history.top().first]=history.top().second;history.pop();}void snapshot(){while(history.size())history.pop();}void rollback(){while(history.size())undo();}};const int mod = MOD9;const int max_n = 200005;struct mint {ll x; // typedef long long ll;mint(ll x=0):x((x%mod+mod)%mod){}mint operator-() const { return mint(-x);}mint& operator+=(const mint a) {if ((x += a.x) >= mod) x -= mod;return *this;}mint& operator-=(const mint a) {if ((x += mod-a.x) >= mod) x -= mod;return *this;}mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}mint operator+(const mint a) const { return mint(*this) += a;}mint operator-(const mint a) const { return mint(*this) -= a;}mint operator*(const mint a) const { return mint(*this) *= a;}mint pow(ll t) const {if (!t) return 1;mint a = pow(t>>1);a *= a;if (t&1) a *= *this;return a;}bool operator==(const mint &p) const { return x == p.x; }bool operator!=(const mint &p) const { return x != p.x; }// for prime modmint inv() const { return pow(mod-2);}mint& operator/=(const mint a) { return *this *= a.inv();}mint operator/(const mint a) const { return mint(*this) /= a;}};istream& operator>>(istream& is, mint& a) { return is >> a.x;}ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}using vm=vector<mint>;using vvm=vector<vm>;struct combination {vector<mint> fact, ifact;combination(int n):fact(n+1),ifact(n+1) {assert(n < mod);fact[0] = 1;for (int i = 1; i <= n; ++i) fact[i] = fact[i-1]*i;ifact[n] = fact[n].inv();for (int i = n; i >= 1; --i) ifact[i-1] = ifact[i]*i;}mint operator()(int n, int k) {if (k < 0 || k > n) return 0;return fact[n]*ifact[k]*ifact[n-k];}}comb(max_n);int main(){ll n,q;cin >> n >> q;UnionFindUndo uf(n*2);ll cnt=n;bool cont=false;rep(_,q){ll t;cin >> t;if(t==1){ll u,v;cin >> u >> v;u--;v--;if(!uf.same(u,v)){cnt--;}uf.merge(u,v);uf.merge(u+n,v+n);if(uf.same(u,u+n)){cont=true;cout << 0 << endl;}else {if(cont)cout << 0 << endl;else cout << mint(2).pow(cnt) << endl;}}else if(t==2){ll u,v;cin >> u >> v;u--;v--;if(!uf.same(u,v)){cnt--;}uf.merge(u,v+n);uf.merge(u+n,v);if(uf.same(u,u+n)){cont=true;cout << 0 << endl;}else {if(cont)cout << 0 << endl;cout << mint(2).pow(cnt) << endl;}}else {uf.rollback();cout << mint(2).pow(n) << endl;cnt=n;cont=false;}}}