結果

問題 No.1647 Travel in Mitaru city 2
ユーザー leaf_1415leaf_1415
提出日時 2021-08-13 21:49:25
言語 C++11
(gcc 11.4.0)
結果
WA  
実行時間 -
コード長 9,081 bytes
コンパイル時間 2,559 ms
コンパイル使用メモリ 123,860 KB
実行使用メモリ 35,388 KB
最終ジャッジ日時 2024-04-14 17:34:15
合計ジャッジ時間 18,974 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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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 WA -
testcase_01 AC 6 ms
7,808 KB
testcase_02 AC 5 ms
7,936 KB
testcase_03 AC 6 ms
7,808 KB
testcase_04 WA -
testcase_05 WA -
testcase_06 AC 6 ms
7,808 KB
testcase_07 WA -
testcase_08 AC 322 ms
33,868 KB
testcase_09 AC 293 ms
32,232 KB
testcase_10 AC 332 ms
33,696 KB
testcase_11 AC 249 ms
30,476 KB
testcase_12 AC 281 ms
31,128 KB
testcase_13 AC 262 ms
29,284 KB
testcase_14 AC 335 ms
34,408 KB
testcase_15 AC 324 ms
34,240 KB
testcase_16 WA -
testcase_17 AC 245 ms
29,372 KB
testcase_18 AC 261 ms
30,040 KB
testcase_19 AC 270 ms
30,812 KB
testcase_20 WA -
testcase_21 AC 300 ms
33,120 KB
testcase_22 AC 343 ms
34,776 KB
testcase_23 AC 346 ms
34,956 KB
testcase_24 AC 304 ms
32,360 KB
testcase_25 AC 290 ms
31,108 KB
testcase_26 WA -
testcase_27 AC 346 ms
34,996 KB
testcase_28 WA -
testcase_29 WA -
testcase_30 AC 324 ms
34,136 KB
testcase_31 WA -
testcase_32 AC 309 ms
33,320 KB
testcase_33 WA -
testcase_34 AC 356 ms
35,260 KB
testcase_35 AC 325 ms
34,896 KB
testcase_36 AC 348 ms
35,384 KB
testcase_37 AC 356 ms
35,160 KB
testcase_38 AC 315 ms
32,952 KB
testcase_39 AC 289 ms
31,248 KB
testcase_40 AC 301 ms
32,872 KB
testcase_41 AC 291 ms
31,972 KB
testcase_42 AC 304 ms
33,040 KB
testcase_43 AC 6 ms
7,936 KB
testcase_44 WA -
testcase_45 AC 256 ms
29,976 KB
testcase_46 AC 283 ms
30,092 KB
testcase_47 AC 267 ms
29,976 KB
testcase_48 AC 280 ms
30,076 KB
testcase_49 AC 276 ms
29,932 KB
testcase_50 AC 271 ms
30,072 KB
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 ll dx[] = {1, 0, -1, 0}, dy[] = {0, -1, 0, 1};

//const ll mod = 1000000007;
const ll mod = 998244353;

struct mint{
	ll x = 0;
	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){
		x *= ope.x, x %= mod;
		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(ll n, ll k){ if(n < 0 || k < 0 || n < k) return mint(0); return fact[n] * fact_inv[k] * fact_inv[n-k];}
mint perm(ll n, ll 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){for(ll i = s; i <= t; i++){ 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 DetectCycle{
	struct edge{
		int to, id;
		edge(){}
		edge(int a, int b){to = a, id = b;}
	};
	int n;
	vector<vector<edge> > G;
	vector<int> used;
	int eid;
	
	DetectCycle(){}
	DetectCycle(int n){init(n);}
	void init(int n){
		this->n = n;
		G.resize(n+1); for(int i = 0; i <= n; i++) G[i].clear();
		used.resize(n+1); for(int i = 0; i <= n; i++) used[i] = 0;
		eid = 0;
	}
	void add_edge(int u, int v){
		eid++;
		G[u].push_back(edge(v, eid));
		if(u != v) G[v].push_back(edge(u, eid));
	}
	int dfs(int v, int eid, vector<ll> &dest)
	{
		used[v] = 1;
		for(auto e : G[v]){
			int u = e.to, id = e.id;
			if(id == eid) continue;
			if(used[u]){
				dest.push_back(v);
				if(u == v) return -1;
				return u;
			}
			int res = dfs(u, id, dest);
			if(res == -1) return -1;
			if(res == -2) continue;
			dest.push_back(v);
			if(v == res) return -1;
			else return res;
		}
		return -2;
	}
	bool getCycle(int v, vector<ll> &dest){ //頂点vを含む連結成分のcycleの頂点を順番にdestに格納。戻り値はcycleの有無
		dest.clear();
		return dfs(v, -1, dest) == -1;
	}
};

struct UnionFind{
	int size;
	vector<int> parent;
	vector<int> rank;
	vector<llint> v, e;
	
	UnionFind(){}
	UnionFind(int size){
		this->size = size;
		parent.resize(size+1);
		rank.resize(size+1);
		v.resize(size+1);
		e.resize(size+1);
		init();
	}
	void init(){
		for(int i = 0; i <= size; i++){
			parent[i] = i, rank[i] = 0;
			v[i] = 1, e[i] = 0;
		}
	}
	int root(int i){
		if(parent[i] == i) return i;
		return parent[i] = root(parent[i]);
	}
	bool same(int i, int j){
		return root(i) == root(j);
	}
	void merge(int i, int j){ // j will become new root
		parent[i] = j;
		v[j] += v[i];
		e[j] += e[i] + 1;
	}
	void unite(int i, int j){
		int root_i = root(i), root_j = root(j);
		if(root_i == root_j){
			e[root_i]++;
			return;
		}
		if(rank[root_i] < rank[root_j]) merge(root_i, root_j);
		else merge(root_j, root_i);
		if(rank[root_i] == rank[root_j]) rank[root_i]++;
	}
};

ll h, w, n;
map<P, ll> mp;
UnionFind uf(200005);

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> h >> w >> n;
	DetectCycle dt(h+w);
	
	ll u, v;
	rep(i, 1, n){
		cin >> u >> v;
		dt.add_edge(u, h+v);
		uf.unite(u, h+v);
		mp[P(u, v)] = i;
		mp[P(v, u)] = i;
	}
	
	vector<ll> vec;
	rep(i, 1, h+w){
		if(uf.root(i) != i) continue;
		if(dt.getCycle(i, vec)) break;
	}
	
	if(sz(vec) == 0){
		outl(-1);
		return 0;
	}
	
	if(vec[0] > h){
		vec.push_back(vec[0]);
		vec.erase(vec.begin());
	}
	for(auto &x : vec) if(x > h) x -= h;
	vector<ll> ans;
	reps(i, vec) ans.push_back(mp[P(vec[i], vec[(i+1)%sz(vec)])]);
	
	outl(sz(ans));
	outl(ans);
	
	return 0;
}
0