結果
| 問題 |
No.3196 Unique Nickname
|
| ユーザー |
theory_and_me
|
| 提出日時 | 2025-07-12 03:07:12 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 2 ms / 2,000 ms |
| コード長 | 5,216 bytes |
| コンパイル時間 | 2,112 ms |
| コンパイル使用メモリ | 209,132 KB |
| 実行使用メモリ | 7,848 KB |
| 最終ジャッジ日時 | 2025-07-12 03:07:16 |
| 合計ジャッジ時間 | 3,069 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 20 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define rep_(i, a_, b_, a, b, ...) for (int i = (a), lim##i = (b); i < lim##i; ++i)
#define rep(i, ...) rep_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
#define drep_(i, a_, b_, a, b, ...) for (int i = (a) - 1, lim##i = (b); i >= lim##i; --i)
#define drep(i, ...) drep_(i, __VA_ARGS__, __VA_ARGS__, __VA_ARGS__, 0)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#ifdef LOCAL
void debug_out() {
cerr << endl;
}
template <class Head, class... Tail> void debug_out(Head H, Tail... T) {
cerr << ' ' << H;
debug_out(T...);
}
#define debug(...) cerr << 'L' << __LINE__ << " [" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define dump(x) cerr << 'L' << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
using ll = long long;
using ld = long double;
template <class T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
template <class T> vector<T> make_vec(size_t n, T a) {
return vector<T>(n, a);
}
template <class... Ts> auto make_vec(size_t n, Ts... ts) {
return vector<decltype(make_vec(ts...))>(n, make_vec(ts...));
}
template <class T> inline void fin(const T x) {
cout << x << '\n';
exit(0);
}
template <class T> inline void deduplicate(vector<T> &a) {
sort(all(a));
a.erase(unique(all(a)), a.end());
}
template <class T> inline bool chmin(T &a, const T b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template <class T> inline bool chmax(T &a, const T b) {
if (a < b) {
a = b;
return true;
}
return false;
}
template <class T> inline int sz(const T &x) {
return x.size();
}
template <class T> inline int count_between(const vector<T> &a, T l, T r) {
return lower_bound(all(a), r) - lower_bound(all(a), l);
}
template <class T1, class T2> istream &operator>>(istream &is, pair<T1, T2> &p) {
is >> p.first >> p.second;
return is;
}
template <class T1, class T2> ostream &operator<<(ostream &os, pair<T1, T2> &p) {
os << '(' << p.first << ", " << p.second << ')';
return os;
}
template <class T, size_t n> istream &operator>>(istream &is, array<T, n> &v) {
for (auto &e : v) is >> e;
return is;
}
template <class T, size_t n> ostream &operator<<(ostream &os, array<T, n> &v) {
for (auto &e : v) os << e << ' ';
return os;
}
template <class T> istream &operator>>(istream &is, vector<T> &v) {
for (auto &e : v) is >> e;
return is;
}
template <class T> ostream &operator<<(ostream &os, vector<T> &v) {
for (auto &e : v) os << e << ' ';
return os;
}
template <class T> istream &operator>>(istream &is, deque<T> &v) {
for (auto &e : v) is >> e;
return is;
}
template <class T> ostream &operator<<(ostream &os, deque<T> &v) {
for (auto &e : v) os << e << ' ';
return os;
}
inline ll floor_div(ll x, ll y) {
if (y < 0) x = -x, y = -y;
return x >= 0 ? x / y : (x - y + 1) / y;
}
inline ll ceil_div(ll x, ll y) {
if (y < 0) x = -x, y = -y;
return x >= 0 ? (x + y - 1) / y : x / y;
}
inline int floor_log2(const ll x) {
assert(x > 0);
return 63 - __builtin_clzll(x);
}
inline int ceil_log2(const ll x) {
assert(x > 0);
return (x == 1) ? 0 : 64 - __builtin_clzll(x - 1);
}
inline int popcount(const ll x) {
return __builtin_popcountll(x);
}
struct fast_ios {
fast_ios() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
cout << fixed << setprecision(20);
};
} fast_ios;
// 時間計測
auto system_now = std::chrono::system_clock::now();
int check_time() {
auto now = std::chrono::system_clock::now();
return std::chrono::duration_cast<std::chrono::milliseconds>(now - system_now).count();
}
// 乱数
struct Xorshift {
uint32_t x = 123456789, y = 362436069, z = 521288629, w = 88675123;
uint32_t rand_int() {
uint32_t t = x ^ (x << 11);
x = y;
y = z;
z = w;
return w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));
}
// 0以上mod未満の整数を乱択
uint32_t rand_int(uint32_t mod) {
return rand_int() % mod;
}
// l以上r未満の整数を乱択
uint32_t rand_int(uint32_t l, uint32_t r) {
assert(l < r);
return l + rand_int(r - l);
}
// 0以上1以下の実数を乱沢
double rand_double() {
return (double)rand_int() / UINT32_MAX;
}
};
Xorshift xor_shift;
// constexpr int INF = numeric_limits<int>::max() >> 2;
// constexpr ll INFll = numeric_limits<ll>::max() >> 2;
// constexpr ld EPS = 1e-10;
// const ld PI = acos(-1.0);
// using mint = modint998244353;
// using mint = modint1000000007;
// using mint = modint;
// using Vm = V<mint>; using VVm = VV<mint>;
int main() {
int N;
cin >> N;
map<string, int> cnt;
vector<vector<string>> S(N, vector<string>(2));
rep(i, N) {
cin >> S[i][0] >> S[i][1];
cnt[S[i][0]]++;
cnt[S[i][1]]++;
}
bool ok = true;
rep(i, N) {
if (cnt[S[i][0]] > 1 && cnt[S[i][1]] > 1) {
ok = false;
break;
}
}
cout << (ok ? "Yes" : "No") << endl;
return 0;
}
theory_and_me