結果

問題 No.1660 Matrix Exponentiation
コンテスト
ユーザー leaf_1415
提出日時 2021-08-27 21:54:40
言語 C++11（廃止可能性あり）
(gcc 13.3.0)
結果
AC  
実行時間 43 ms / 2,000 ms
コード長 9,019 bytes
コンパイル時間 1,296 ms
コンパイル使用メモリ 110,244 KB
実行使用メモリ 15,440 KB
最終ジャッジ日時 2024-11-21 02:07:58
合計ジャッジ時間 2,673 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 27
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#include <utility>
#include <complex>
#include <unordered_set>
#include <unordered_map>
#define rep(x, s, t) for(ll x = (s); (x) <= (t); (x)++)
#define per(x, s, t) for(ll x = (s); (x) >= (t); (x)--)
#define reps(x, s) for(ll x = 0; (x) < (ll)(s).size(); (x)++)
#define chmin(x, y) (x) = min((x), (y))
#define chmax(x, y) (x) = max((x), (y))
#define sz(x) ((ll)(x).size())
#define ceil(x, y) (((x)+(y)-1) / (y))
#define all(x) (x).begin(),(x).end()
#define outl(...) dump_func(__VA_ARGS__)
#define outf(x) cout << fixed << setprecision(16) << (x) << endl
#define inf 1e18
const double PI = 3.1415926535897932384626433;

using namespace std;

typedef long long llint;
typedef long long ll;
typedef pair<ll, ll> P;

struct edge{
	ll to, cost;
	edge(){}
	edge(ll a, ll b){ to = a, cost = b;}
};
const int dx[] = {1, 0, -1, 0}, dy[] = {0, -1, 0, 1};

const int mod = 1000000007;
//const int mod = 998244353;

struct mint{
	ll x;
	mint(ll y = 0){x = y; if(x < 0 || x >= mod) x = (x%mod+mod)%mod;}
	mint(const mint &ope) {x = ope.x;}
	
	mint operator-(){return mint(-x);}
	mint operator+(const mint &ope){return mint(x) += ope;}
	mint operator-(const mint &ope){return mint(x) -= ope;}
	mint operator*(const mint &ope){return mint(x) *= ope;}
	mint operator/(const mint &ope){return mint(x) /= ope;}
	mint& operator+=(const mint &ope){
		x += ope.x;
		if(x >= mod) x -= mod;
		return *this;
	}
	mint& operator-=(const mint &ope){
		x += mod - ope.x;
		if(x >= mod) x -= mod;
		return *this;
	}
	mint& operator*=(const mint &ope){
		ll tmp = x;
		tmp *= ope.x, tmp %= mod;
		x = tmp;
		return *this;
	}
	mint& operator/=(const mint &ope){
		ll n = mod-2; mint mul = ope;
		while(n){
			if(n & 1) *this *= mul;
			mul *= mul;
			n >>= 1;
		}
		return *this;
	}
	mint inverse(){return mint(1) / *this;}
	bool operator ==(const mint &ope){return x == ope.x;}
	bool operator !=(const mint &ope){return x != ope.x;}
	bool operator <(const mint &ope){return x < ope.x;}
};
mint modpow(mint a, ll n){
	if(n == 0) return mint(1);
	if(n % 2) return a * modpow(a, n-1);
	else return modpow(a*a, n/2);
}
istream& operator >>(istream &is, mint &ope){
	ll t; is >> t, ope.x = t;
	return is;
}
ostream& operator <<(ostream &os, mint &ope){return os << ope.x;}
ostream& operator <<(ostream &os, const mint &ope){return os << ope.x;}

vector<mint> fact, fact_inv;
void make_fact(int n){
	fact.resize(n+1), fact_inv.resize(n+1);
	fact[0] = mint(1); rep(i, 1, n) fact[i] = fact[i-1] * mint(i);
	fact_inv[n] = fact[n].inverse(); per(i, n-1, 0) fact_inv[i] = fact_inv[i+1] * mint(i+1);
}
mint comb(int n, int k){ if(n < 0 || k < 0 || n < k) return mint(0); return fact[n] * fact_inv[k] * fact_inv[n-k];}
mint perm(int n, int k){ return comb(n, k) * fact[k]; }

vector<int> prime, pvec;
void make_prime(int n){
	prime.resize(n+1);
	rep(i, 2, n){
		if(prime[i]) continue;
		for(int j = i; j <= n; j+=i) prime[j] = i;
	}
	rep(i, 2, n) if(prime[i] == i) pvec.push_back(i);
}

bool exceed(ll x, ll y, ll m){return x >= m / y + 1;}
void mark(){ cout << "*" << endl; }
void yes(){ cout << "YES" << endl; }
void no(){ cout << "NO" << endl; }
ll sgn(ll x){ if(x > 0) return 1; if(x < 0) return -1; return 0;}
ll gcd(ll a, ll b){if(b == 0) return a; return gcd(b, a%b);}
ll lcm(ll a, ll b){return a/gcd(a, b)*b;}
ll digitnum(ll x, ll b = 10){ll ret = 0; for(; x; x /= b) ret++; return ret;}
ll digitsum(ll x, ll b = 10){ll ret = 0; for(; x; x /= b) ret += x % b; return ret;}
string lltos(ll x){string ret; for(;x;x/=10) ret += x % 10 + '0'; reverse(ret.begin(), ret.end()); return ret;}
ll stoll(string &s){ll ret = 0; for(auto c : s) ret *= 10, ret += c - '0'; return ret;}
template<typename T>
void uniq(T &vec){ sort(vec.begin(), vec.end()); vec.erase(unique(vec.begin(), vec.end()), vec.end());}

template<class S, class T> pair<S, T>& operator+=(pair<S,T> &s, const pair<S,T> &t){
	s.first += t.first, s.second += t.second;
	return s;
}
template<class S, class T> pair<S, T>& operator-=(pair<S,T> &s, const pair<S,T> &t){
	s.first -= t.first, s.second -= t.second;
	return s;
}
template<class S, class T> pair<S, T> operator+(const pair<S,T> &s, const pair<S,T> &t){
	return pair<S,T>(s.first+t.first, s.second+t.second);
}
template<class S, class T> pair<S, T> operator-(const pair<S,T> &s, const pair<S,T> &t){
	return pair<S,T>(s.first-t.first, s.second-t.second);
}
template<typename T>
ostream& operator << (ostream& os, vector<T>& vec) {
	for(int i = 0; i < vec.size(); i++) os << vec[i] << (i + 1 == vec.size() ? "" : " ");
	return os;
}
template<typename T>
ostream& operator << (ostream& os, deque<T>& deq) {
	for(int i = 0; i < deq.size(); i++) os << deq[i] << (i + 1 == deq.size() ? "" : " ");
	return os;
}
template<typename T, typename U>
ostream& operator << (ostream& os, pair<T, U>& pair_var) {
	os << "(" << pair_var.first << ", " << pair_var.second << ")";
	return os;
}
template<typename T, typename U>
ostream& operator << (ostream& os, const pair<T, U>& pair_var) {
	os << "(" << pair_var.first << ", " << pair_var.second << ")";
	return os;
}
template<typename T, typename U>
ostream& operator << (ostream& os, map<T, U>& map_var) {
	for(typename map<T, U>::iterator itr = map_var.begin(); itr != map_var.end(); itr++) {
		os << "(" << itr->first << ", " << itr->second << ")";
		itr++; if(itr != map_var.end()) os << ","; itr--;
	}
	return os;
}
template<typename T>
ostream& operator << (ostream& os, set<T>& set_var) {
	for(typename set<T>::iterator itr = set_var.begin(); itr != set_var.end(); itr++) {
		os << *itr; ++itr; if(itr != set_var.end()) os << " "; itr--;
	}
	return os;
}
template<typename T>
ostream& operator << (ostream& os, multiset<T>& set_var) {
	for(typename multiset<T>::iterator itr = set_var.begin(); itr != set_var.end(); itr++) {
		os << *itr; ++itr; if(itr != set_var.end()) os << " "; itr--;
	}
	return os;
}
template<typename T>
void outa(T a[], ll s, ll t){rep(i, s, t){ cout << a[i]; if(i < t) cout << " ";}cout << endl;}
void dump_func(){cout << endl;}
template <class Head, class... Tail>
void dump_func(Head &&head, Tail &&... tail) {
	cout << head;
	if(sizeof...(Tail) > 0) cout << " ";
	dump_func(std::move(tail)...);
}


struct SCC{
	int n;
	vector<vector<int> > G, revG, compG;
	vector<int> used, scc, topo;
	int sccid, sccnum;
	
	void tpdfs(int v)
	{
		used[v] = 1;
		for(int i = 0; i < G[v].size(); i++){
			if(!used[G[v][i]]) tpdfs(G[v][i]);
		}
		topo.push_back(v);
	}
	void sccdfs(int v, int id)
	{
		used[v] = 1;
		scc[v] = id;
		for(int i = 0; i < revG[v].size(); i++){
			if(!used[revG[v][i]]) sccdfs(revG[v][i], id);
		}
	}
	
	SCC(){}
	SCC(int n){  //V(G) = {1, 2, ..., n}, nを制約より大きくするときは注意
		this->n = n;
		G.resize(n+1);
		revG.resize(n+1);
		used.resize(n+1);
	}
	void init(){
		for(int i = 1; i <= n; i++){
			G[i].clear(), revG[i].clear();
			used[i] = 0;
		}
		topo.clear();
	}
	void add_edge(int u, int v)
	{
		G[u].push_back(v);
	}
	void tpsort()
	{
		topo.clear();
		for(int i = 1; i <= n; i++) used[i] = 0;
		for(int i = 1; i <= n; i++) if(!used[i]) tpdfs(i);
		reverse(topo.begin(), topo.end());
	}
	bool checkDAG(){ //先にtpsort()を呼ぶべし。DAGならtrueを返す
		for(int i = 1; i <= n; i++) used[i] = 0;
		for(int i = 0; i < topo.size(); i++){
			int v = topo[i];
			used[v] = 1;
			for(int j = 0; j < G[v].size(); j++){
				if(used[G[v][j]]) return false;
			}
		}
		return true;
	}
	int calcSCC(){  //先にtpsort()を呼ぶべし。戻り値はSCCの個数。SCC-IDは1-indexed
		scc.resize(n+1);
		for(int i = 1; i <= n; i++) revG[i].clear();
		for(int i = 1; i <= n; i++){
			for(int j = 0; j < G[i].size(); j++){
				revG[G[i][j]].push_back(i);
			}
		}
		sccid = 1;
		for(int i = 1; i <= n; i++) used[i] = 0;
		for(int i = 0; i < topo.size(); i++) if(!used[topo[i]]) sccdfs(topo[i], sccid++);
		return sccnum = sccid-1;
	}
	void compressSCC(bool simple = false){ //先にcalcSCC()を呼ぶべし。圧縮後のグラフはSCC::compG
		compG.resize(sccnum+1);
		for(int i = 1; i <= n; i++){
			for(int j = 0; j < G[i].size(); j++){
				int u = G[i][j];
				if(scc[i] != scc[u]) compG[scc[i]].push_back(scc[u]);
			}
		}
		if(simple){
			for(int i = 1; i <= sccnum; i++){
				sort(compG[i].begin(), compG[i].end());
				compG[i].erase(unique(compG[i].begin(), compG[i].end()), compG[i].end());
			}
		}
	}
	
};

ll n, k;
ll dp[100005];

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> k;
	SCC scc(n);
	
	ll u, v;
	rep(i, 1, k){
		cin >> u >> v;
		scc.add_edge(u, v);
	}
	scc.tpsort();
	if(!scc.checkDAG()){
		outl(-1);
		return 0;
	}
	
	for(auto v : scc.topo){
		for(auto u : scc.G[v]){
			chmax(dp[u], dp[v]+1);
		}
	}
	
	ll ans = 0;
	rep(i, 1, n) chmax(ans, dp[i]);
	outl(ans+1);
	
	return 0;
}
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