結果
問題 | No.3070 Collecting Coins Speedrun 2 |
ユーザー |
👑 ![]() |
提出日時 | 2025-03-21 21:51:47 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 12 ms / 2,000 ms |
コード長 | 3,366 bytes |
コンパイル時間 | 815 ms |
コンパイル使用メモリ | 77,420 KB |
実行使用メモリ | 5,888 KB |
最終ジャッジ日時 | 2025-03-21 21:51:51 |
合計ジャッジ時間 | 2,100 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 * 32 |
ソースコード
#ifdef NACHIA#define _GLIBCXX_DEBUG#else#define NDEBUG#endif#include <iostream>#include <string>#include <vector>#include <algorithm>using i64 = long long;using u64 = unsigned long long;#define rep(i,n) for(i64 i=0; i<i64(n); i++)const i64 INF = 1001001001001001001;template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }using namespace std;#include <utility>#include <cassert>namespace nachia{// ax + by = gcd(a,b)// return ( x, - )std::pair<long long, long long> ExtGcd(long long a, long long b){long long x = 1, y = 0;while(b){long long u = a / b;std::swap(a-=b*u, b);std::swap(x-=y*u, y);}return std::make_pair(x, a);}} // namespace nachianamespace nachia{template<unsigned int MOD>struct StaticModint{private:using u64 = unsigned long long;unsigned int x;public:using my_type = StaticModint;template< class Elem >static Elem safe_mod(Elem x){if(x < 0){if(0 <= x+MOD) return x + MOD;return MOD - ((-(x+MOD)-1) % MOD + 1);}return x % MOD;}StaticModint() : x(0){}StaticModint(const my_type& a) : x(a.x){}StaticModint& operator=(const my_type&) = default;template< class Elem >StaticModint(Elem v) : x(safe_mod(v)){}unsigned int operator*() const { return x; }my_type& operator+=(const my_type& r) { auto t = x + r.x; if(t >= MOD) t -= MOD; x = t; return *this; }my_type operator+(const my_type& r) const { my_type res = *this; return res += r; }my_type& operator-=(const my_type& r) { auto t = x + MOD - r.x; if(t >= MOD) t -= MOD; x = t; return *this; }my_type operator-(const my_type& r) const { my_type res = *this; return res -= r; }my_type operator-() const noexcept { my_type res = *this; res.x = ((res.x == 0) ? 0 : (MOD - res.x)); return res; }my_type& operator*=(const my_type& r){ x = (u64)x * r.x % MOD; return *this; }my_type operator*(const my_type& r) const { my_type res = *this; return res *= r; }bool operator==(const my_type& r) const { return x == r.x; }my_type pow(unsigned long long i) const {my_type a = *this, res = 1;while(i){ if(i & 1){ res *= a; } a *= a; i >>= 1; }return res;}my_type inv() const { return my_type(ExtGcd(x, MOD).first); }unsigned int val() const { return x; }int hval() const { return int(x > MOD/2 ? x - MOD : x); }static constexpr unsigned int mod() { return MOD; }static my_type raw(unsigned int val) { auto res = my_type(); res.x = val; return res; }my_type& operator/=(const my_type& r){ return operator*=(r.inv()); }my_type operator/(const my_type& r) const { return operator*(r.inv()); }};} // namespace nachiausing Modint = nachia::StaticModint<998244353>;void testcase(){i64 N; cin >> N;vector<i64> A(N); rep(i,N) cin >> A[i];if(A.back() <= 0 || A.front() >= 0){cout << Modint(2).pow(N-1).val() << "\n";} else if(binary_search(A.begin(), A.end(), 0)){cout << (Modint(2).pow(N-2) * 3).val() << "\n";} else {cout << Modint(2).pow(N-1).val() << "\n";}}int main(){ios::sync_with_stdio(false); cin.tie(nullptr);rep(f,1) testcase();return 0;}