結果
| 問題 |
No.2277 Honest or Dishonest ?
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2023-04-21 22:24:06 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 59 ms / 2,000 ms |
| コード長 | 5,497 bytes |
| コンパイル時間 | 2,578 ms |
| コンパイル使用メモリ | 206,372 KB |
| 最終ジャッジ日時 | 2025-02-12 11:58:21 |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 50 |
ソースコード
#include <bits/stdc++.h>
using namespace std ;
#define fast_input_output ios::sync_with_stdio(false); cin.tie(nullptr);
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
#pragma GCC target("avx")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
typedef long long ll ;
typedef long double ld ;
typedef pair<ll,ll> P ;
typedef tuple<ll,ll,ll> TP ;
#define chmin(a,b) a = min(a,b)
#define chmax(a,b) a = max(a,b)
#define bit_count(x) __builtin_popcountll(x)
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) a / gcd(a,b) * b
#define rep(i,n) for(int i = 0 ; i < n ; i++)
#define rrep(i,a,b) for(int i = a ; i < b ; i++)
#define repi(it,S) for(auto it = S.begin() ; it != S.end() ; it++)
#define pt(a) cout << a << endl
#define DEBUG(...) ; cout << #__VA_ARGS__ << endl ; for(auto x : {__VA_ARGS__}) cout << x << " " ; cout << endl ;
#define DEBUG_LIST(...) cout << #__VA_ARGS__ << endl ; DEBUG_REP(__VA_ARGS__) ;
#define DEBUG_REP(V) cout << "{ " ; repi(itr,V) cout << *itr << ", " ; cout << "}" << endl ;
#define debug(a) cout << #a << " " << a << endl
#define all(a) a.begin(), a.end()
#define endl "\n"
const int mod = 998244353 ;
template< int mod >
struct ModInt {
int x;
ModInt() : x(0) {}
ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
ModInt &operator+=(const ModInt &p) {
if((x += p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator-=(const ModInt &p) {
if((x += mod - p.x) >= mod) x -= mod;
return *this;
}
ModInt &operator*=(const ModInt &p) {
x = (int) (1LL * x * p.x % mod);
return *this;
}
ModInt &operator/=(const ModInt &p) {
*this *= p.inverse();
return *this;
}
ModInt operator-() const { return ModInt(-x); }
ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }
ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }
ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }
ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }
bool operator==(const ModInt &p) const { return x == p.x; }
bool operator!=(const ModInt &p) const { return x != p.x; }
ModInt inverse() const {
int a = x, b = mod, u = 1, v = 0, t;
while(b > 0) {
t = a / b;
swap(a -= t * b, b);
swap(u -= t * v, v);
}
return ModInt(u);
}
ModInt pow(int64_t n) const {
ModInt ret(1), mul(x);
while(n > 0) {
if(n & 1) ret *= mul;
mul *= mul;
n >>= 1;
}
return ret;
}
friend ostream &operator<<(ostream &os, const ModInt &p) {
return os << p.x;
}
friend istream &operator>>(istream &is, ModInt &a) {
int64_t t;
is >> t;
a = ModInt< mod >(t);
return (is);
}
static int get_mod() { return mod; }
};
using modint = ModInt< mod >;
struct UnionFind {
private:
vector<int> par ; //親
vector<int> lank ; //木の深さ
vector<int> volume ; //構成する集合のサイズ
vector<int> edge ; //構成する集合の辺の数
public:
UnionFind(int n){
//n要素で初期化
par.resize(n) ;
lank.resize(n) ;
volume.resize(n) ;
edge.resize(n) ;
for(int i = 0 ; i < n ; i++){
par[i] = i ;
lank[i] = 0 ;
volume[i] = 1 ;
edge[i] = 0 ;
}
}
//木の根を求める
int root(int x) {
if(par[x] == x) return x ;
else return par[x] = root(par[x]) ;
}
//xとyの属する集合を合併
void unite(int x , int y){
x = root(x);
y = root(y) ;
if(x == y) {
edge[x]++ ;
return ;
}
if(lank[x] < lank[y]){
par[x] = y ;
volume[y] += volume[x] ;
edge[y] += edge[x] + 1 ;
} else {
par[y] = x ;
volume[x] += volume[y] ;
edge[x] += edge[y] + 1 ;
if(lank[x] == lank[y]) lank[x]++ ;
}
}
bool same(int x , int y) { return root(x) == root(y) ; }
int size(int x) { return volume[root(x)] ; }
int edge_num(int x) { return edge[root(x)] ; }
};
int n, q;
struct edge{
int to;
int t;
};
vector<edge> G[101010];
int BL[101010];
bool dfs(int v, int prev){
bool b = true;
for(edge e : G[v]){
int u = e.to;
int val = (BL[v] + e.t) % 2;
if(BL[u] != -1) {
if(BL[u] != val) return false;
continue;
}
if(u == prev) continue;
BL[u] = val;
b &= dfs(u,v);
}
return b;
}
int main(){
fast_input_output
cin >> n >> q;
UnionFind uf(n);
vector<int> A(q), B(q), C(q);
rep(i,q) cin >> A[i] >> B[i] >> C[i], A[i]--, B[i]--;
rep(i,q){
int a = A[i], b = B[i];
uf.unite(a,b);
bool c = C[i];
G[a].push_back({b,c});
G[b].push_back({a,c});
}
rep(i,n) BL[i] = -1;
modint res = 1;
rep(i,n){
if(BL[i] != -1) continue;
BL[i] = 0;
if(!dfs(i,-1)){
cout << 0 << endl;
return 0;
}
res *= 2;
}
cout << res << endl;
}