結果
問題 | No.2089 置換の符号 |
ユーザー |
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提出日時 | 2022-09-30 21:43:49 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 16 ms / 2,000 ms |
コード長 | 2,376 bytes |
コンパイル時間 | 3,613 ms |
コンパイル使用メモリ | 255,032 KB |
最終ジャッジ日時 | 2025-02-07 19:18:06 |
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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ファイルパターン | 結果 |
---|---|
other | AC * 33 |
ソースコード
#include <bits/stdc++.h>using namespace std;using ll = long long;using ld = long double;using pll = pair<ll, ll>;using tlll = tuple<ll, ll, ll>;constexpr ll INF = 1LL << 60;template<class T> bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}template<class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}ll safemod(ll A, ll M) {ll res = A % M; if (res < 0) res += M; return res;}ll divfloor(ll A, ll B) {if (B < 0) {return divfloor(-A, -B);} return (A - safemod(A, B)) / B;}ll divceil(ll A, ll B) {if (B < 0) {return divceil(-A, -B);} return divfloor(A + B - 1, B);}ll pow_ll(ll A, ll B) {if (A == 0 || A == 1) {return A;} if (A == -1) {return B & 1 ? -1 : 1;} ll res = 1; for (int i = 0; i < B; i++) {res *= A;}return res;}ll logfloor(ll A, ll B) {assert(A >= 2); ll res = 0; for (ll tmp = 1; tmp <= B / A; tmp *= A) {res++;} return res;}ll logceil(ll A, ll B) {assert(A >= 2); ll res = 0; for (ll tmp = 1; tmp < B; tmp *= A) {res++;} return res;}ll arisum_ll(ll a, ll d, ll n) { return n * a + (n & 1 ? ((n - 1) >> 1) * n : (n >> 1) * (n - 1)) * d; }ll arisum2_ll(ll a, ll l, ll n) { return n & 1 ? ((a + l) >> 1) * n : (n >> 1) * (a + l); }ll arisum3_ll(ll a, ll l, ll d) { assert((l - a) % d == 0); return arisum2_ll(a, l, (l - a) / d + 1); }template<class T> void unique(vector<T> &V) {V.erase(unique(V.begin(), V.end()), V.end());}template<class T> void sortunique(vector<T> &V) {sort(V.begin(), V.end()); V.erase(unique(V.begin(), V.end()), V.end());}#define FINALANS(A) do {cout << (A) << '\n'; exit(0);} while (false)template<class T> void printvec(const vector<T> &V) {int _n = V.size(); for (int i = 0; i < _n; i++) cout << V[i] << (i == _n - 1 ? "" : " ");cout <<'\n';}template<class T> void printvect(const vector<T> &V) {for (auto v : V) cout << v << '\n';}template<class T> void printvec2(const vector<vector<T>> &V) {for (auto &v : V) printvec(v);}//*#include <atcoder/all>using namespace atcoder;using mint = modint998244353;//using mint = modint1000000007;//using mint = modint;//*/int main(){ll N;cin >> N;vector<ll> S(N);for (ll i = 0; i < N; i++){cin >> S.at(i);S.at(i)--;}dsu ds(N);for (ll i = 0; i < N; i++){ds.merge(i, S.at(i));}ll res = N - ds.groups().size();ll ans = (res % 2 == 0 ? 1 : -1);cout << ans << endl;}