結果

問題 No.1254 補強への架け橋
ユーザー heno239heno239
提出日時 2020-10-09 21:41:48
言語 C++14
(gcc 13.2.0 + boost 1.83.0)
結果
AC  
実行時間 99 ms / 2,000 ms
コード長 3,596 bytes
コンパイル時間 1,243 ms
コンパイル使用メモリ 120,348 KB
実行使用メモリ 85,188 KB
最終ジャッジ日時 2023-09-27 15:54:38
合計ジャッジ時間 14,883 ms
ジャッジサーバーID
(参考情報)
judge13 / judge14
このコードへのチャレンジ
(要ログイン)

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 AC 19 ms
68,824 KB
testcase_01 AC 20 ms
68,820 KB
testcase_02 AC 20 ms
68,904 KB
testcase_03 AC 19 ms
68,900 KB
testcase_04 AC 20 ms
68,884 KB
testcase_05 AC 19 ms
68,816 KB
testcase_06 AC 20 ms
69,008 KB
testcase_07 AC 19 ms
68,852 KB
testcase_08 AC 20 ms
68,908 KB
testcase_09 AC 20 ms
68,816 KB
testcase_10 AC 19 ms
68,912 KB
testcase_11 AC 19 ms
68,816 KB
testcase_12 AC 19 ms
68,848 KB
testcase_13 AC 19 ms
68,976 KB
testcase_14 AC 19 ms
68,920 KB
testcase_15 AC 20 ms
68,988 KB
testcase_16 AC 19 ms
68,820 KB
testcase_17 AC 20 ms
68,904 KB
testcase_18 AC 19 ms
68,816 KB
testcase_19 AC 19 ms
69,096 KB
testcase_20 AC 20 ms
69,104 KB
testcase_21 AC 20 ms
68,908 KB
testcase_22 AC 20 ms
68,848 KB
testcase_23 AC 20 ms
68,908 KB
testcase_24 AC 20 ms
68,828 KB
testcase_25 AC 20 ms
68,900 KB
testcase_26 AC 19 ms
68,828 KB
testcase_27 AC 20 ms
68,912 KB
testcase_28 AC 20 ms
69,108 KB
testcase_29 AC 20 ms
68,848 KB
testcase_30 AC 19 ms
68,944 KB
testcase_31 AC 19 ms
68,976 KB
testcase_32 AC 19 ms
68,912 KB
testcase_33 AC 19 ms
68,924 KB
testcase_34 AC 19 ms
68,832 KB
testcase_35 AC 19 ms
68,964 KB
testcase_36 AC 20 ms
68,916 KB
testcase_37 AC 20 ms
69,000 KB
testcase_38 AC 20 ms
68,924 KB
testcase_39 AC 19 ms
68,816 KB
testcase_40 AC 20 ms
68,824 KB
testcase_41 AC 20 ms
68,948 KB
testcase_42 AC 19 ms
69,052 KB
testcase_43 AC 20 ms
68,952 KB
testcase_44 AC 19 ms
68,976 KB
testcase_45 AC 19 ms
69,032 KB
testcase_46 AC 19 ms
68,964 KB
testcase_47 AC 19 ms
68,852 KB
testcase_48 AC 19 ms
68,892 KB
testcase_49 AC 19 ms
68,828 KB
testcase_50 AC 20 ms
68,972 KB
testcase_51 AC 19 ms
68,968 KB
testcase_52 AC 20 ms
68,968 KB
testcase_53 AC 20 ms
68,996 KB
testcase_54 AC 20 ms
68,876 KB
testcase_55 AC 20 ms
69,124 KB
testcase_56 AC 19 ms
68,912 KB
testcase_57 AC 19 ms
68,936 KB
testcase_58 AC 20 ms
69,140 KB
testcase_59 AC 20 ms
68,984 KB
testcase_60 AC 19 ms
69,000 KB
testcase_61 AC 20 ms
69,008 KB
testcase_62 AC 19 ms
68,908 KB
testcase_63 AC 23 ms
69,376 KB
testcase_64 AC 21 ms
69,184 KB
testcase_65 AC 21 ms
69,232 KB
testcase_66 AC 21 ms
69,236 KB
testcase_67 AC 20 ms
69,040 KB
testcase_68 AC 21 ms
69,140 KB
testcase_69 AC 22 ms
69,140 KB
testcase_70 AC 21 ms
69,212 KB
testcase_71 AC 21 ms
69,120 KB
testcase_72 AC 22 ms
69,260 KB
testcase_73 AC 20 ms
69,092 KB
testcase_74 AC 21 ms
69,244 KB
testcase_75 AC 22 ms
69,308 KB
testcase_76 AC 20 ms
68,924 KB
testcase_77 AC 21 ms
69,228 KB
testcase_78 AC 23 ms
69,268 KB
testcase_79 AC 23 ms
69,220 KB
testcase_80 AC 22 ms
69,144 KB
testcase_81 AC 22 ms
69,284 KB
testcase_82 AC 22 ms
69,256 KB
testcase_83 AC 67 ms
74,448 KB
testcase_84 AC 62 ms
74,268 KB
testcase_85 AC 42 ms
72,140 KB
testcase_86 AC 53 ms
73,568 KB
testcase_87 AC 56 ms
73,996 KB
testcase_88 AC 25 ms
69,568 KB
testcase_89 AC 62 ms
74,708 KB
testcase_90 AC 44 ms
72,432 KB
testcase_91 AC 38 ms
71,640 KB
testcase_92 AC 30 ms
70,132 KB
testcase_93 AC 54 ms
73,316 KB
testcase_94 AC 49 ms
72,944 KB
testcase_95 AC 48 ms
73,012 KB
testcase_96 AC 64 ms
74,320 KB
testcase_97 AC 35 ms
71,068 KB
testcase_98 AC 63 ms
74,268 KB
testcase_99 AC 43 ms
72,156 KB
testcase_100 AC 64 ms
74,520 KB
testcase_101 AC 28 ms
69,984 KB
testcase_102 AC 24 ms
69,396 KB
testcase_103 AC 29 ms
70,248 KB
testcase_104 AC 32 ms
70,876 KB
testcase_105 AC 51 ms
73,192 KB
testcase_106 AC 38 ms
71,432 KB
testcase_107 AC 62 ms
74,536 KB
testcase_108 AC 60 ms
74,616 KB
testcase_109 AC 53 ms
73,260 KB
testcase_110 AC 46 ms
72,916 KB
testcase_111 AC 55 ms
73,208 KB
testcase_112 AC 32 ms
70,540 KB
testcase_113 AC 46 ms
72,688 KB
testcase_114 AC 38 ms
71,404 KB
testcase_115 AC 25 ms
69,488 KB
testcase_116 AC 41 ms
71,544 KB
testcase_117 AC 34 ms
70,540 KB
testcase_118 AC 58 ms
74,000 KB
testcase_119 AC 44 ms
71,836 KB
testcase_120 AC 57 ms
73,944 KB
testcase_121 AC 31 ms
70,476 KB
testcase_122 AC 39 ms
71,636 KB
testcase_123 AC 20 ms
68,848 KB
testcase_124 AC 98 ms
85,148 KB
testcase_125 AC 99 ms
85,188 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<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
#include<complex>
#include<numeric>
#include<array>
using namespace std;

//#define int long long
typedef long long ll;

typedef unsigned long long ul;
typedef unsigned int ui;
constexpr ll mod = 1000000007;
const ll INF = mod * mod;
typedef pair<int, int>P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
#define all(v) (v).begin(),(v).end()
typedef pair<ll, ll> LP;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-12;
const ld pi = acosl(-1.0);

ll mod_pow(ll x, ll n, ll m = mod) {
	ll res = 1;
	while (n) {
		if (n & 1)res = res * x % m;
		x = x * x % m; n >>= 1;
	}
	return res;
}
struct modint {
	ll n;
	modint() :n(0) { ; }
	modint(ll m) :n(m) {
		if (n >= mod)n %= mod;
		else if (n < 0)n = (n % mod + mod) % mod;
	}
	operator int() { return n; }
};
bool operator==(modint a, modint b) { return a.n == b.n; }
modint operator+=(modint& a, modint b) { a.n += b.n; if (a.n >= mod)a.n -= mod; return a; }
modint operator-=(modint& a, modint b) { a.n -= b.n; if (a.n < 0)a.n += mod; return a; }
modint operator*=(modint& a, modint b) { a.n = ((ll)a.n * b.n) % mod; return a; }
modint operator+(modint a, modint b) { return a += b; }
modint operator-(modint a, modint b) { return a -= b; }
modint operator*(modint a, modint b) { return a *= b; }
modint operator^(modint a, ll n) {
	if (n == 0)return modint(1);
	modint res = (a * a) ^ (n / 2);
	if (n % 2)res = res * a;
	return res;
}

ll inv(ll a, ll p) {
	return (a == 1 ? 1 : (1 - p * inv(p % a, a)) / a + p);
}
modint operator/(modint a, modint b) { return a * modint(inv(b, mod)); }

const int max_n = 1 << 22;
modint fact[max_n], factinv[max_n];
void init_f() {
	fact[0] = modint(1);
	for (int i = 0; i < max_n - 1; i++) {
		fact[i + 1] = fact[i] * modint(i + 1);
	}
	factinv[max_n - 1] = modint(1) / fact[max_n - 1];
	for (int i = max_n - 2; i >= 0; i--) {
		factinv[i] = factinv[i + 1] * modint(i + 1);
	}
}
modint comb(int a, int b) {
	if (a < 0 || b < 0 || a < b)return 0;
	return fact[a] * factinv[b] * factinv[a - b];
}


void solve() {
	int n; cin >> n;
	vector<int> a(n), b(n);
	vector<vector<int>> G(n);
	rep(i, n) {
		cin >> a[i] >> b[i];
		a[i]--; b[i]--;
		G[a[i]].push_back(b[i]);
		G[b[i]].push_back(a[i]);
	}
	vector<int> vs;
	vector<bool> used(n);
	int las = 0;
	function<bool(int, int)> dfs = [&](int id, int fr)->bool {
		used[id] = true;
		for (int to : G[id])if (to != fr) {
			if (used[to]) {
				vs.push_back(id); las = to;
				return true;
			}
			if (dfs(to, id)) {
				vs.push_back(id);
				return true;
			}
		}
		return false;
	};
	dfs(0, -1);
	vector<bool> inc(n, false);
	rep(i, vs.size()) {
		inc[vs[i]] = true;
		if (vs[i] == las)break;
	}
	vector<int> ans;
	rep(i, n) {
		if (inc[a[i]] && inc[b[i]]) {
			ans.push_back(i);
		}
	}
	cout << ans.size() << "\n";
	rep(i, ans.size()) {
		if (i > 0)cout << " ";
		cout << ans[i] + 1;
	}
	cout << "\n";
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	//cout << fixed << setprecision(15);
	//init_f();
	//init();
	//expr();
	//int t; cin >> t; rep(i, t)
	solve();
	return 0;
}
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