結果

問題 No.583 鉄道同好会
ユーザー hiyokko2
提出日時 2017-10-28 00:19:14
言語 C++11(廃止可能性あり)
(gcc 13.3.0)
結果
WA  
実行時間 -
コード長 3,450 bytes
コンパイル時間 619 ms
コンパイル使用メモリ 77,048 KB
実行使用メモリ 11,648 KB
最終ジャッジ日時 2024-11-22 00:02:56
合計ジャッジ時間 1,508 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 15 WA * 1
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 #
プレゼンテーションモードにする

#include <iostream>
#include <vector>
#include <string.h>
#include <stack>
#include <queue>
#include <algorithm>
#include <climits>
#include <cmath>
#include <map>
#include <set>
#include <assert.h>
#include <sstream>
#define REP(i,n) for(ll i=0;i<(n);i++)
#define MOD 1000000007
#define int long long
#ifdef int
const long long INF = LLONG_MAX / 10;
#else
const int INF = 1010101010;
#endif
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
typedef pair<int, int> P;
//typedef pair<double, double> P;
#ifdef LOCAL
#define dump(...) \
do { \
std::ostringstream os; \
os << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; \
print_to(os, ", ", "\n", __VA_ARGS__); \
std::cerr << os.str(); \
} while (0)
#define dump_(a) \
do { \
std::ostringstream os; \
os << __LINE__ << ":\t" << #a << " = ["; \
print_to_(os, ", ", "]\n", all(a)); \
std::cerr << os.str(); \
} while (0)
#else
#define dump(...)
#define dump_(...)
#endif
template <typename T>
void print_to(std::ostream &os, const char *, const char *tail, const T &fst) {
os << fst << tail;
}
template <typename Fst, typename... Rst>
void print_to(std::ostream &os, const char *del, const char *tail, const Fst &fst, const Rst &... rst) {
os << fst << del;
print_to(os, del, tail, rst...);
}
template <typename Iter>
void print_to_(std::ostream &os, const char *del, const char *tail, Iter bgn, Iter end) {
for (Iter it = bgn; it != end;) {
os << *it;
if (++it != end) {
os << del;
} else {
os << tail;
}
}
}
template <typename Fst, typename... Rst>
void println(const Fst &fst, const Rst &... rst) {
print_to(std::cout, "\n", "\n", fst, rst...);
}
template <typename Fst, typename... Rst>
void print(const Fst &fst, const Rst &... rst) {
print_to(std::cout, " ", "\n", fst, rst...);
}
template <typename Iter>
void println_(Iter bgn, Iter end) {
print_to_(std::cout, "\n", "\n", bgn, end);
}
template <typename Iter>
void print_(Iter bgn, Iter end) {
print_to_(std::cout, " ", "\n", bgn, end);
}
// const int MOD = 1000000007;
namespace trush {
int _ = (std::cout.precision(10), std::cout.setf(std::ios::fixed), std::cin.tie(0),
std::ios::sync_with_stdio(0), 0);
}
int N, M;
int Sa, Sb;
int degree[510];
struct edge
{
int to;
bool used;
};
vector<edge> G[510];
bool dfs(int v, int n)
{
if (n == M) return true;
for (edge e : G[v]) {
if (!e.used) {
e.used = true;
if (dfs(e.to, n + 1)) return true;
e.used = false;
}
}
return false;
}
signed main()
{
cin >> N >> M;
REP(i,M) {
cin >> Sa >> Sb;
G[Sa].push_back(edge{Sb, false});
G[Sb].push_back(edge{Sa, false});
degree[Sa]++;
degree[Sb]++;
}
int oddNum = 0;
REP(i,N) if (degree[i] % 2 == 1) oddNum++;
bool con = dfs(Sa, 0);
if (con && (oddNum == 0 || oddNum == 2)) {
cout << "YES" << endl;
} else {
cout << "NO" << endl;
}
}
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