結果
| 問題 |
No.1023 Cyclic Tour
|
| コンテスト | |
| ユーザー |
wk
|
| 提出日時 | 2020-04-10 22:30:50 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 4,347 bytes |
| コンパイル時間 | 1,913 ms |
| コンパイル使用メモリ | 176,072 KB |
| 実行使用メモリ | 54,620 KB |
| 最終ジャッジ日時 | 2024-09-15 21:00:23 |
| 合計ジャッジ時間 | 7,913 ms |
|
ジャッジサーバーID (参考情報) |
judge6 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 WA * 1 |
| other | AC * 8 WA * 4 TLE * 1 -- * 36 |
ソースコード
#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; (i) < (n); (i)++)
#define INF 5000000000000000
using namespace std;
struct Edge{
int to;
long weight;
Edge(int t, long w) : to(t), weight(w) {}
};
long modpow(long a, long n, long mod) {
long res = 1;
while (n > 0) {
if (n & 1) res = res * a % mod;
a = a * a % mod;
n >>= 1;
}
return res;
}
// a^{-1} mod を計算する
long modinv(long a, long mod) {
return modpow(a, mod - 2, mod);
}
struct compare1 {
bool operator()(const pair<long, long>& value,
const long& key)
{
return (value.first < key);
}
bool operator()(const long& key,
const pair<long, long>& value)
{
return (key < value.first);
}
};
struct UnionFind {
vector<int> par;
vector<int> rank;
UnionFind(int n = 1){
init(n);
}
void init(int n = 1){
par.resize(n);
rank.resize(n);
REP(i, n) par[i] = i, rank[i] = 0;
}
int root(int x){
if(par[x] == x) return x;
else return par[x] = root(par[x]);
}
bool issame(int x, int y){
return root(x) == root(y);
}
bool merge(int x, int y){
x = root(x); y = root(y);
if(x == y) return false;
if(rank[x] < rank[y]) swap(x, y);
if(rank[x] == rank[y]) rank[x]++;
par[y] = x;
return true;
}
};
template<class Abel> struct weightedUnionFind{
vector<int> par;
vector<int> rank;
vector<Abel> diff_weight;
weightedUnionFind(int n = 1, Abel SUM_UNITY = 0){
init(n, SUM_UNITY);
}
void init(int n = 1, Abel SUM_UNITY = 0){
par.resize(n); rank.resize(n); diff_weight.resize(n);
REP(i, n) par[i] = i, rank[i] = 0, diff_weight[i] = SUM_UNITY;
}
int root(int x){
if(par[x] == x) return x;
else{
int r = root(par[x]);
diff_weight[x] += diff_weight[par[x]];
return par[x] = r;
}
}
Abel weight(int x){
root(x);
return diff_weight[x];
}
bool issame(int x, int y){
return root(x) == root(y);
}
bool merge(int x, int y, Abel w){
w += weight(x); w -= weight(y);
x = root(x); y = root(y);
if(x == y) return false;
if(rank[x] < rank[y]) swap(x, y), w = -w;
if(rank[x] == rank[y]) rank[x]++;
par[y] = x;
diff_weight[y] = w;
return true;
}
Abel diff(int x, int y){
return weight(y) - weight(x);
}
};
using Graph = vector<vector<int>>;
using P = pair<int, int>;
/*
void dijkstra(int s, int V, Graph &G, long* d){
priority_queue<P, vector<P>, greater<P>> pque;
fill(d, d + V, INF);
d[s] = 0;
pque.push(P(0, s));
while(!pque.empty()){
P p = pque.top(); pque.pop();
int now = p.second;
if(d[now] < p.first) continue;
REP(i, G[now].size()){
Edge e = G[now][i];
if(d[e.to] > d[now] + e.weight){
d[e.to] = d[now] + e.weight;
pque.push(P(d[e.to], e.to));
}
}
}
}
*/
int GCD(int a, int b){
if(b == 0) return a;
if(a < b) return GCD(b, a);
else return GCD(b, a%b);
}
bool dfs(int i, int end, Graph &G, vector<bool> seen){
//cout << i << " " << end << endl;
if(i == end && seen[i]) return true;
seen[i] = true;
for(int j=0;j<G[i].size();j++){
//cout << i << " next " << G[i][j] << endl;
if(seen[j]) continue;
int temp = G[i][j];
G[i].erase(G[i].begin() + j);
if(dfs(G[i][j], end, G, seen)) return true;
G[i].insert(G[i].begin() + j, temp);
//cout << "revive " << G[i][j] << " = " << temp << endl;
}
return false;
}
int main()
{
int N, M; cin >> N >> M;
Graph G(N);
REP(i, M){
int a, b, c; cin >> a >> b >> c;
a--, b--;
if(c == 1){
G[a].push_back(b);
G[b].push_back(a);
}else{
G[a].push_back(b);
}
}
vector<bool> seen(N);
REP(i, N){
REP(j, N) seen[j] = false;
if(dfs(i, i, G, seen)){
cout << "Yes" << endl;
return 0;
}
}
cout << "No" << endl;
return 0;
}
wk