結果
問題 | No.1972 Modulo Set |
ユーザー |
|
提出日時 | 2022-06-10 21:30:21 |
言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 2,556 bytes |
コンパイル時間 | 1,810 ms |
コンパイル使用メモリ | 176,352 KB |
実行使用メモリ | 21,632 KB |
最終ジャッジ日時 | 2024-09-21 06:00:09 |
合計ジャッジ時間 | 5,682 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 29 WA * 5 |
ソースコード
#include <bits/stdc++.h>using namespace std;#define double long doubleusing ll = long long;using VB = vector<bool>;using VVB = vector<VB>;using VC = vector<char>;using VI = vector<int>;using VVI = vector<VI>;using VVVI = vector<VVI>;using VL = vector<ll>;using VVL = vector<VL>;using VVVL = vector<VVL>;using VVVVL = vector<VVVL>;using VD = vector<double>;using VVD = vector<VD>;using VVVD = vector<VVD>;using P = pair<int, int>;#define REP(i, n) for (int i = 0; i < (int)(n); i++)#define FOR(i, a, b) for (ll i = a; i < (ll)(b); i++)#define ALL(a) (a).begin(),(a).end()constexpr int INF = 1001001001;constexpr ll LINF = 1001001001001001001ll;constexpr int DX[] = {1, 0, -1, 0};constexpr int DY[] = {0, 1, 0, -1};template< typename T1, typename T2>inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true); }template< typename T1, typename T2>inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true); }const ll MOD = 1000000007;const int MAX_N = 200010;int par[MAX_N];int rnk[MAX_N];int siz[MAX_N];void init(int n) {REP(i,n) {par[i] = i;rnk[i] = 0;siz[i] = 1;}}int find(int x) {if (par[x] == x) {return x;} else {return par[x] = find(par[x]);}}void unite(int x, int y) {x = find(x);y = find(y);if (x == y) return;int s = siz[x] + siz[y];if (rnk[x] < rnk[y]) {par[x] = y;} else {par[y] = x;if (rnk[x] == rnk[y]) rnk[x]++;}siz[find(x)] = s;}bool same(int x, int y) {return find(x) == find(y);}int size(int x) {return siz[find(x)];}ll mod_pow(ll x, ll n, ll mod) {ll res = 1;while (n > 0) {if (n & 1) res = res * x % mod;x = x * x % mod;n >>= 1;}return res;}VL f(MAX_N + 1, 1);ll C(ll n, ll k) {if (n < k) return 0;return f[n] * mod_pow(f[k], MOD - 2, MOD) % MOD * mod_pow(f[n - k], MOD - 2, MOD) % MOD;}int main() {ios::sync_with_stdio(false);std::cin.tie(nullptr);ll N, M, A, ans = 0;cin >> N >> M;map<ll, int> mp;REP(i, N) {cin >> A;mp[A % M]++;if (A % M != 0) mp[M - A % M] += 0;}for (auto i : mp) {int x = i.first, y = i.second;if (x == 0) continue;if (x + x == M) continue;ans += max(y, mp[M - x]);//cout << x << " " << y << " " << ans << endl;}ans /= 2;ans += min(1, mp[0]);if (M % 2 == 0) ans += min(1, mp[M / 2]);cout << ans << endl;}