結果
| 問題 |
No.1645 AB's abs
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-08-13 21:27:14 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 5 ms / 2,000 ms |
| コード長 | 3,419 bytes |
| コンパイル時間 | 1,937 ms |
| コンパイル使用メモリ | 196,700 KB |
| 最終ジャッジ日時 | 2025-01-23 18:11:11 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 36 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < n; i++)
#define rep2(i, x, n) for(int i = x; i <= n; i++)
#define rep3(i, x, n) for(int i = x; i >= n; i--)
#define each(e, v) for(auto &e: v)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
//const int MOD = 1000000007;
const int MOD = 998244353;
const int inf = (1<<30)-1;
const ll INF = (1LL<<60)-1;
template<typename T> bool chmax(T &x, const T &y) {return (x < y)? (x = y, true) : false;};
template<typename T> bool chmin(T &x, const T &y) {return (x > y)? (x = y, true) : false;};
struct io_setup{
io_setup(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout << fixed << setprecision(15);
}
} io_setup;
template<int mod>
struct Mod_Int{
int x;
Mod_Int() : x(0) {}
Mod_Int(long long y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
Mod_Int &operator += (const Mod_Int &p){
if((x += p.x) >= mod) x -= mod;
return *this;
}
Mod_Int &operator -= (const Mod_Int &p){
if((x += mod - p.x) >= mod) x -= mod;
return *this;
}
Mod_Int &operator *= (const Mod_Int &p){
x = (int) (1LL * x * p.x % mod);
return *this;
}
Mod_Int &operator /= (const Mod_Int &p){
*this *= p.inverse();
return *this;
}
Mod_Int &operator ++ () {return *this += Mod_Int(1);}
Mod_Int operator ++ (int){
Mod_Int tmp = *this;
++*this;
return tmp;
}
Mod_Int &operator -- () {return *this -= Mod_Int(1);}
Mod_Int operator -- (int){
Mod_Int tmp = *this;
--*this;
return tmp;
}
Mod_Int operator - () const {return Mod_Int(-x);}
Mod_Int operator + (const Mod_Int &p) const {return Mod_Int(*this) += p;}
Mod_Int operator - (const Mod_Int &p) const {return Mod_Int(*this) -= p;}
Mod_Int operator * (const Mod_Int &p) const {return Mod_Int(*this) *= p;}
Mod_Int operator / (const Mod_Int &p) const {return Mod_Int(*this) /= p;}
bool operator == (const Mod_Int &p) const {return x == p.x;}
bool operator != (const Mod_Int &p) const {return x != p.x;}
Mod_Int inverse() const{
assert(*this != Mod_Int(0));
return pow(mod-2);
}
Mod_Int pow(long long k) const{
Mod_Int now = *this, ret = 1;
for(; k > 0; k >>= 1, now *= now){
if(k&1) ret *= now;
}
return ret;
}
friend ostream &operator << (ostream &os, const Mod_Int &p){
return os << p.x;
}
friend istream &operator >> (istream &is, Mod_Int &p){
long long a;
is >> a;
p = Mod_Int<mod>(a);
return is;
}
};
using mint = Mod_Int<MOD>;
int main(){
int N; cin >> N;
vector<int> A(N);
rep(i, N) cin >> A[i];
int M = 10000;
vector<mint> dp(2*M+1, 0);
dp[M] = 1;
rep(i, N){
vector<mint> tmp(2*M+1, 0);
rep2(j, 0, 2*M){
if(dp[j] == 0) continue;
tmp[j+A[i]] += dp[j], tmp[j-A[i]] += dp[j];
}
swap(dp, tmp);
}
mint ans = 0;
rep2(i, 0, 2*M){
ans += dp[i]*abs(i-M);
}
cout << ans << '\n';
}