Submission #1239254

#TimeUsernameProblemLanguageResultExecution timeMemory
1239254matsakyannnThousands Islands (IOI22_islands)C++20
1.75 / 100
18 ms4168 KiB
#include <bits/stdc++.h> #include <variant> using namespace std; #ifndef ONLINE_JUDGE #define dbg(x) cerr << #x << ' '; print(x); cerr << endl; #else #define dbg(x) #endif void print(int x) {cerr << x;} void print(long long x) {cerr << x;} void print(char x) {cerr << x;} void print(string x) {cerr << x;} void print(double x) {cerr << x;} template <class T> void print(vector <T> x); template <class T> void print(set <T> x); template <class T> void print(multiset <T> x); template <class T, class V> void print(pair <T, V> x); template <class T, class V> void print(map <T, V> x); template <class T> void print(vector <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";} template <class T> void print(set <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";} template <class T> void print(multiset <T> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";} template <class T, class V> void print(pair <T, V> x) {cerr << "{"; print(x.first); cerr << ' '; print(x.second); cerr << "}";} template <class T, class V> void print(map <T, V> x) {cerr << "[ "; for(auto i : x) {print(i); cerr << ' ';} cerr << "]";} #define ll long long #define pb push_back #define ppb pop_back #define PII pair <int, int> #define PLL pair <ll, ll> #define all(v) (v).begin(), (v).end() #define OK cerr << "OK\n"; #define MP make_pair const int N0 = 1005, M0 = 2e5 + 5; int n, m; vector <int> G[N0]; bool visited[N0]; bool dfs(int node, int parent){ bool cycle = 0; visited[node] = 1; for(int u : G[node]){ if(u == parent) continue; if(visited[u]) cycle = 1; else cycle |= dfs(u, node); } return cycle; } variant <bool, vector <int>> find_journey(int N, int M, vector<int> U, vector<int> V){ for(int i = 0; i < M; i++){ G[U[i]].pb(V[i]); } return dfs(0, -1); }
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