結果

問題 No.2345 max(l,r)
ユーザー Kude
提出日時 2023-06-09 23:49:05
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 82 ms / 2,000 ms
コード長 2,967 bytes
コンパイル時間 2,352 ms
コンパイル使用メモリ 221,240 KB
最終ジャッジ日時 2025-02-14 00:53:12
ジャッジサーバーID
(参考情報)
judge2 / judge4
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 * 1
other AC * 68
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp:49:6: warning: ‘{anonymous}::mint {anonymous}::perm(int, int)’ defined but not used [-Wunused-function]
   49 | mint perm(int n, int k) {
      |      ^~~~
main.cpp:48:6: warning: ‘{anonymous}::mint {anonymous}::fact(int)’ defined but not used [-Wunused-function]
   48 | mint fact(int n) {return Fact[n];}
      |      ^~~~
main.cpp:44:6: warning: ‘{anonymous}::mint {anonymous}::icomb(int, int)’ defined but not used [-Wunused-function]
   44 | mint icomb(int n, int k) {
      |      ^~~~~

ソースコード

diff #
プレゼンテーションモードにする

#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;
constexpr int FACT_SIZE = 1000000;
mint Fact[FACT_SIZE + 1];
mint iFact[FACT_SIZE + 1];
const auto fact_init = [] {
Fact[0] = mint::raw(1);
for(int i = 1; i <= FACT_SIZE; ++i) {
Fact[i] = Fact[i-1] * i;
}
iFact[FACT_SIZE] = Fact[FACT_SIZE].inv();
for(int i = FACT_SIZE; i; --i) {
iFact[i-1] = iFact[i] * i;
}
return false;
}();
mint comb(int n, int k) {
if (k == 0) return mint::raw(1);
assert(n >= 0 && k >= 0);
if (k > n) return mint::raw(0);
return Fact[n] * iFact[n - k] * iFact[k];
}
mint icomb(int n, int k) {
return iFact[n] * Fact[n - k] * Fact[k];
}
mint fact(int n) {return Fact[n];}
mint perm(int n, int k) {
assert(0 <= n);
return Fact[n] * iFact[n - k];
}
} int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int tt;
cin >> tt;
while(tt--) {
int n, m;
cin >> n >> m;
VI a(n);
rep(i, n) cin >> a[i];
sort(rall(a));
int used = 0;
mint ans = 1;
int c0 = 0, c1 = 0;
for(int i = 0; i < n;) {
int j = i + 1;
while(j < n && a[j] == a[i]) j++;
int mx = a[i], cnt = j - i;
if (c0 > c1) swap(c0, c1);
if (c1 > mx) {
ans = 0;
break;
}
int D = n - j;
if (c1 == mx) {
if (c0 + D > mx) {
ans = 0;
break;
}
used++;
c1 += cnt;
} else if (c0 == c1) {
if (D + c0 == mx) {
used++;
c1 += cnt;
if (D > 0) ans *= 2;
} else if (cnt % 2 == 0 && D + cnt / 2 + c0 == mx) {
used += 2;
c0 += cnt / 2;
c1 += cnt / 2;
ans *= comb(cnt, cnt / 2);
} else {
ans = 0;
break;
}
} else if (D + c0 == mx) {
used++;
c1 += cnt;
} else if (D + c1 == mx) {
used++;
c0 += cnt;
} else {
int x = mx - D - c0, y = mx - D - c1;
if (x <= 0 || y <= 0 || x + y != cnt) {
ans = 0;
break;
}
used += 2;
c0 += x;
c1 += y;
ans *= comb(x + y, x);
}
i = j;
}
if (ans.val()) ans *= comb(m, used);
cout << ans.val() << '\n';
}
}
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