#584048 (C++17) No.1238 選抜クラス

• 問題: No.1238 選抜クラス
• ユーザー: kkktym
• 提出日時: 2020-11-25 13:47:28
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 875 ms / 2,000 ms
• コード長: 2,380 bytes
• コンパイル時間: 1,024 ms
• コンパイル使用メモリ: 103,948 KB
• 最終ジャッジ日時: 2025-01-16 05:37:26
• ジャッジサーバーID （参考情報）: judge3 / judge4

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
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <utility>
#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <cstdio>
#include <limits>
#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if(a < b){ a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if(a > b){ a = b; return 1; } return 0; }
template<class T> inline int  sz(T &a) { return a.size(); }
using ll = long long; using ld = long double;
using pi = pair<int,int>; using pl = pair<ll,ll>;
using vi = vector<int>; using vvi = vector<vi>;
using vl = vector<ll>; using vvl = vector<vl>;
const int inf = numeric_limits<int>::max();
const ll infll = numeric_limits<ll>::max();
// Modint
// modint<MOD> で宣言
template<ll MOD>
struct modint{
  ll x;
  ll mod = MOD;
  modint(ll x=0):x(x%MOD){}
  modint& operator+=(const modint a){
    if((x+=a.x)>=MOD) x-=MOD;
    return *this;
  }
  modint& operator-=(const modint a){
    if((x += MOD-a.x)>=MOD) x-=MOD;
    return *this;
  }
  modint& operator*=(const modint a){
    (x*=a.x)%=MOD;
    return *this;
  }
  modint operator+(const modint a) const{
    modint res(*this);
    return res+=a;
  }
  modint operator-(const modint a) const{
    modint res(*this);
    return res-=a;
  }
  modint operator*(const modint a) const{
    modint res(*this);
    return res*=a;
  }
  modint pow(ll t) const{
    if(!t) return 1;
    modint a = pow(t>>1);
    a*=a;
    if(t&1) a*=*this;
    return a;
  }
  
  //for prime mod
  modint inv() const{
    return pow(MOD-2);
  }
  modint& operator/=(const modint a){
    return (*this) *= a.inv();
  }
  modint operator/(const modint a) const{
    modint res(*this);
    return res/=a;
  }
};
using mint = modint<1000000007>;
int main()
{
  int n,k; cin >> n >> k;
  vi a(n);
  rep(i,n) cin >> a[i];
  vector<vector<mint>> dp1(n+1, vector<mint>(10001));
  dp1[0][0].x = 1;
  rep(c,n) {
    vector<vector<mint>> dp2(n+1, vector<mint>(10001));    
    rep(i,n) {
      rep(j,10001) {
    if(j + a[c] <= 10000) {
      dp2[i+1][j+a[c]] += dp1[i][j];
    }
    dp2[i][j] += dp1[i][j];
      }
    }
    swap(dp1, dp2);
  }
  mint res;
  rep1(i,n) {
    rep(j,10001) {
      if(j / i >= k) res += dp1[i][j];
    }
  }
  cout << res.x << "\n";
  return 0;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX