#689360 (C++17) No.1645 AB's abs

• 問題: No.1645 AB's abs
• ユーザー: snow39
• 提出日時: 2021-08-13 22:35:47
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 6 ms / 2,000 ms
• コード長: 3,496 bytes
• コンパイル時間: 1,060 ms
• コンパイル使用メモリ: 107,696 KB
• 最終ジャッジ日時: 2025-01-23 20:17:49
• ジャッジサーバーID （参考情報）: judge1 / judge2

ファイルパターン	結果
sample	AC * 3
other	AC * 36

ソースコード

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <tuple>
#include <vector>
#define mkp make_pair
#define mkt make_tuple
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define all(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
template <class T>
void chmin(T& a, const T& b) {
    if (a > b) a = b;
}
template <class T>
void chmax(T& a, const T& b) {
    if (a < b) a = b;
}
template <long long mod>
class modint {
private:
    using T = long long;
    T a;
public:
    constexpr modint(const long long x = 0) noexcept : a((x % mod + mod) % mod) {}
    constexpr T& value() noexcept {
        return a;
    }
    constexpr const T& value() const noexcept {
        return a;
    }
    constexpr modint operator-() const noexcept {
        return modint(0) -= *this;
    }
    constexpr modint operator+(const modint& rhs) const noexcept {
        return modint(*this) += rhs;
    }
    constexpr modint operator-(const modint& rhs) const noexcept {
        return modint(*this) -= rhs;
    }
    constexpr modint operator*(const modint& rhs) const noexcept {
        return modint(*this) *= rhs;
    }
    constexpr modint operator/(const modint& rhs) const noexcept {
        return modint(*this) /= rhs;
    }
    constexpr modint& operator+=(const modint& rhs) noexcept {
        a += rhs.a;
        if (a >= mod) a -= mod;
        return *this;
    }
    constexpr modint& operator-=(const modint& rhs) noexcept {
        if (a < rhs.a) a += mod;
        a -= rhs.a;
        return *this;
    }
    constexpr modint& operator*=(const modint& rhs) noexcept {
        a = a * rhs.a % mod;
        return *this;
    }
    constexpr modint& operator/=(const modint& rhs) noexcept {
        return *this *= rhs.inv();
    }
    constexpr bool operator==(const modint& rhs) const noexcept {
        return a == rhs.a;
    }
    constexpr bool operator!=(const modint& rhs) const noexcept {
        return not(*this == rhs);
    }
    constexpr modint pow(long long k) const noexcept {
        modint ret(1);
        modint x = k > 0 ? *this : this->inv();
        k = abs(k);
        while (k > 0) {
            if (k & 1) ret *= x;
            x *= x;
            k >>= 1;
        }
        return ret;
    }
    constexpr modint inv() const noexcept {
        return pow(mod - 2);
    }
    friend std::ostream& operator<<(std::ostream& os, const modint& X) noexcept {
        return os << X.a;
    }
    friend std::istream& operator>>(std::istream& is, modint& X) noexcept {
        is >> X.a;
        X.a %= mod;
        if (X.a < 0) X.a += mod;
        return is;
    }
};
const int BASE = 1e4;
using mint = modint<998244353>;
void solve() {
    int N;
    cin >> N;
    vector<int> A(N);
    rep(i, N) cin >> A[i];
    vector<mint> dp(2 * BASE + 1, 0);
    dp[BASE] = 1;
    rep(i, N) {
        vector<mint> ndp(2 * BASE + 1, 0);
        rep(j, 2 * BASE + 1) {
            if (dp[j] == 0) continue;
            ndp[j - A[i]] += dp[j];
            ndp[j + A[i]] += dp[j];
        }
        swap(dp, ndp);
    }
    mint ans = 0;
    rep(j, 2 * BASE + 1) {
        if (j <= BASE)
            ans += mint(BASE - j) * dp[j];
        else
            ans += mint(j - BASE) * dp[j];
    }
    cout << ans << endl;
}
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    solve();
    return 0;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX