結果

問題 No.2914 正閉路検出
ユーザー 👑 binapbinap
提出日時 2024-10-04 23:13:23
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 138 ms / 2,000 ms
コード長 3,677 bytes
コンパイル時間 4,045 ms
コンパイル使用メモリ 274,744 KB
実行使用メモリ 35,448 KB
最終ジャッジ日時 2024-10-04 23:13:36
合計ジャッジ時間 10,044 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
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 AC 1 ms
5,248 KB
testcase_01 AC 1 ms
5,248 KB
testcase_02 AC 1 ms
5,248 KB
testcase_03 AC 2 ms
5,248 KB
testcase_04 AC 2 ms
5,248 KB
testcase_05 AC 2 ms
5,248 KB
testcase_06 AC 2 ms
5,248 KB
testcase_07 AC 2 ms
5,248 KB
testcase_08 AC 2 ms
5,248 KB
testcase_09 AC 1 ms
5,248 KB
testcase_10 AC 2 ms
5,248 KB
testcase_11 AC 1 ms
5,248 KB
testcase_12 AC 2 ms
5,248 KB
testcase_13 AC 1 ms
5,248 KB
testcase_14 AC 1 ms
5,248 KB
testcase_15 AC 1 ms
5,248 KB
testcase_16 AC 1 ms
5,248 KB
testcase_17 AC 2 ms
5,248 KB
testcase_18 AC 1 ms
5,248 KB
testcase_19 AC 23 ms
5,248 KB
testcase_20 AC 45 ms
6,920 KB
testcase_21 AC 13 ms
5,248 KB
testcase_22 AC 56 ms
7,308 KB
testcase_23 AC 38 ms
6,532 KB
testcase_24 AC 63 ms
7,504 KB
testcase_25 AC 6 ms
5,248 KB
testcase_26 AC 9 ms
5,248 KB
testcase_27 AC 70 ms
8,712 KB
testcase_28 AC 86 ms
11,608 KB
testcase_29 AC 113 ms
18,660 KB
testcase_30 AC 15 ms
7,552 KB
testcase_31 AC 68 ms
8,712 KB
testcase_32 AC 84 ms
11,600 KB
testcase_33 AC 13 ms
7,552 KB
testcase_34 AC 104 ms
14,940 KB
testcase_35 AC 114 ms
18,408 KB
testcase_36 AC 111 ms
18,784 KB
testcase_37 AC 119 ms
35,448 KB
testcase_38 AC 110 ms
34,552 KB
testcase_39 AC 119 ms
25,332 KB
testcase_40 AC 128 ms
34,292 KB
testcase_41 AC 136 ms
28,408 KB
testcase_42 AC 134 ms
34,932 KB
testcase_43 AC 138 ms
34,300 KB
testcase_44 AC 120 ms
24,740 KB
testcase_45 AC 133 ms
33,140 KB
testcase_46 AC 132 ms
32,500 KB
testcase_47 AC 130 ms
31,480 KB
testcase_48 AC 126 ms
26,140 KB
testcase_49 AC 131 ms
33,652 KB
testcase_50 AC 129 ms
31,596 KB
testcase_51 AC 92 ms
12,152 KB
testcase_52 AC 91 ms
12,152 KB
testcase_53 AC 90 ms
12,152 KB
testcase_54 AC 91 ms
12,156 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<bits/stdc++.h>
#include<atcoder/all>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<vector<int>> vvi;
typedef vector<vector<long long>> vvl;
typedef long double ld;
typedef pair<int, int> P;

template <int m> ostream& operator<<(ostream& os, const static_modint<m>& a) {os << a.val(); return os;}
template <int m> ostream& operator<<(ostream& os, const dynamic_modint<m>& a) {os << a.val(); return os;}
template <int m> istream& operator>>(istream& is, static_modint<m>& a) {long long x; is >> x; a = x; return is;}
template <int m> istream& operator>>(istream& is, dynamic_modint<m>& a) {long long x; is >> x; a = x; return is;}
template<typename T> istream& operator>>(istream& is, vector<T>& v){int n = v.size(); assert(n > 0); rep(i, n) is >> v[i]; return is;}
template<typename U, typename T> ostream& operator<<(ostream& os, const pair<U, T>& p){os << p.first << ' ' << p.second; return os;}
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : " "); return os;}
template<typename T> ostream& operator<<(ostream& os, const vector<vector<T>>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : ""); return os;}
template<typename T> ostream& operator<<(ostream& os, const set<T>& se){for(T x : se) os << x << " "; os << "\n"; return os;}
template<typename T> ostream& operator<<(ostream& os, const unordered_set<T>& se){for(T x : se) os << x << " "; os << "\n"; return os;}
template<typename S, auto op, auto e> ostream& operator<<(ostream& os, const atcoder::segtree<S, op, e>& seg){int n = seg.max_right(0, [](S){return true;}); rep(i, n) os << seg.get(i) << (i == n - 1 ? "\n" : " "); return os;}
template<typename S, auto op, auto e, typename F, auto mapping, auto composition, auto id> ostream& operator<<(ostream& os, const atcoder::lazy_segtree<S, op, e, F, mapping, composition, id>& seg){int n = seg.max_right(0, [](S){return true;}); rep(i, n) os << seg.get(i) << (i == n - 1 ? "\n" : " "); return os;}

template<typename T> void chmin(T& a, T b){a = min(a, b);}
template<typename T> void chmax(T& a, T b){a = max(a, b);}

int main(){
	int n, m;
	cin >> n >> m;
	vector<vector<tuple<int, int, long long>>> graph(n);
	vector<pair<int, int>> uv;
	rep(i, m){
		int u, v;
		long long c;
		cin >> u >> v >> c;
		u--; v--;
		graph[u].emplace_back(i, v, c);
		graph[v].emplace_back(i, u, -c);
		uv.emplace_back(u, v);
	}
	vector<int> check(n);
	vector<long long> potential(n);
	
	vector<int> ans;
	deque<int> de;
	int ans_from;
	
	auto dfs = [&](auto self, int from, long long prev) -> void{
		check[from] = 1;
		for(auto [idx, to, c] : graph[from]){
			if(ans.size()) return;
			if(idx == prev) continue;
			if(check[to]){
				if(potential[to] != potential[from] + c){
					int pos = from;
					ans.push_back(idx);
					while(pos != to){
						int idx = de.back(); de.pop_back();
						if(uv[idx].first == pos) pos = uv[idx].second;
						else pos = uv[idx].first;
						ans.push_back(idx);
					}
					ans_from = to;
					if(potential[to] > potential[from] + c){
					}else{
						reverse(ans.begin(), ans.end());
					}
				}
			}else{
				potential[to] = potential[from] + c;
				de.push_back(idx);
				self(self, to, idx);
				if(ans.size() == int(0)) de.pop_back();
			}
		}
	};
	
	rep(i, n){
		if(ans.size()) break;
		if(check[i]) continue;
		dfs(dfs, i, -1);
	}
	if(ans.size()){
		cout << ans.size() << "\n";
		cout << ans_from + 1 << "\n";
		for(int& idx : ans) idx++;
		cout << ans;
	}else{
		cout << "-1\n";
	}
	return 0;
}
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