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답안 #987730

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
987730 2024-05-23T13:03:03 Z underwaterkillerwhale Skyscraper (JOI16_skyscraper) C++17
100 / 100
 199 ms 126020 KB 
#include <bits/stdc++.h>
#define se              second
#define fs              first
#define pb              push_back
#define ll              long long
#define ii              pair<ll,ll>
#define ld              long double
#define SZ(v)           (int)v.size()
#define ALL(v)          v.begin(), v.end()
#define bit(msk, i)     ((msk >> i) & 1)
#define iter(id, v)     for(auto id : v)
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)

using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rd); }

const int N = 100 + 7;
const ll Mod = 1e9 + 7;
const int szBL = 916;
const ll INF = 1e9;
const int BASE = 137;

int n, L;
int a[N];
int dp[N][N * 10][N][3];

inline void add (int &a, int b) { a += b; if (a >= Mod) a -= Mod; }

void solution () {
    cin >> n >> L;
    rep (i, 1, n) cin >> a[i];
    sort (a + 1, a + 1 + n);
    if (n == 1) dp[1][0][0][2] = 1;
    dp[1][0][2][0] = 1;
    dp[1][0][1][1] = 2;

    rep (i, 1, n - 1) {
        int D = a[i + 1] - a[i];
        rep (j, 0, L)
        rep (k, 0, n) {
            int newcost = j + 2 * D * (k - 1);
            if (newcost <= L && k >= 3) {
                add (dp[i + 1][newcost][k][0], 1LL * dp[i][j][k][0] * 2 % Mod * (k - 2) % Mod);
                add (dp[i + 1][newcost][k + 1][0], 1LL * dp[i][j][k][0] * (k - 2) % Mod);
                add (dp[i + 1][newcost][k - 1][0], 1LL * dp[i][j][k][0] * (k - 2) % Mod);
//                if (i + 1 == 3 && newcost == 4) {
//                    cout << i<<","<<j<<","<<k<<","<<0<<": "<<dp[i][j][k][0] <<"\n";
//                }
            }
            if (newcost <= L && k >= 2) {
                add (dp[i + 1][newcost][k - 1][1], 1LL * dp[i][j][k][0] * 2 % Mod);
                add (dp[i + 1][newcost][k][1], 1LL * dp[i][j][k][0] * 2 % Mod);
                add (dp[i + 1][newcost][k][0], 1LL * dp[i][j][k][0] * 2 % Mod);
                add (dp[i + 1][newcost][k + 1][0], 1LL * dp[i][j][k][0] * 2 % Mod);
//                if (i + 1 == 3 && newcost == 4) {
//                    cout << i<<","<<j<<","<<k<<","<<0<<": "<<dp[i][j][k][0] <<" ji\n";
//                }
            }
            newcost = j + 2 * D * (k - 1) + D;
            if (newcost <= L && k >= 2) {
                add (dp[i + 1][newcost][k][1], 1LL * dp[i][j][k][1] * 2 % Mod * (k - 1) % Mod);
                add (dp[i + 1][newcost][k + 1][1], 1LL * dp[i][j][k][1] * (k - 1) % Mod);
                add (dp[i + 1][newcost][k - 1][1], 1LL * dp[i][j][k][1] * (k - 1) % Mod);

            }
            if (newcost <= L && k >= 1) {
                add (dp[i + 1][newcost][k][2], dp[i][j][k][1]);
                add (dp[i + 1][newcost][k - 1][2], dp[i][j][k][1]);
                add (dp[i + 1][newcost][k][1], dp[i][j][k][1]);
                add (dp[i + 1][newcost][k + 1][1], dp[i][j][k][1]);
            }
            newcost = j + 2 * D * k;
            if (newcost <= L && k >= 1) {
                add (dp[i + 1][newcost][k][2], 1LL * dp[i][j][k][2] * 2 % Mod * k % Mod);
                add (dp[i + 1][newcost][k + 1][2], 1LL * dp[i][j][k][2] * k % Mod);
                add (dp[i + 1][newcost][k - 1][2], 1LL * dp[i][j][k][2] * k % Mod);
//                if (i + 1 == 3 && newcost == 3) {
//                    cout << i<<","<<j<<","<<k<<","<<2<<": "<<dp[i][j][k][2] <<" ji\n";
//                }
            }
        }
    }
    ll res = 0;
    rep (i, 0, L) {
        (res += dp[n][i][0][2]) %= Mod;
    }
    cout << res <<"\n";
}

#define file(name) freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);

int main () {
//    file("teamwork");
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll num_Test = 1, dummy;
//    cin >> dummy >> num_Test;
    while(num_Test--)
        solution();
}
/*
*/

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:98:22: warning: unused variable 'dummy' [-Wunused-variable]
   98 |     ll num_Test = 1, dummy;
      |                      ^~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2908 KB Output is correct
5 Correct 5 ms 9564 KB Output is correct
6 Correct 5 ms 8796 KB Output is correct
7 Correct 2 ms 3676 KB Output is correct
8 Correct 1 ms 3164 KB Output is correct
9 Correct 5 ms 9560 KB Output is correct
10 Correct 2 ms 3416 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 3420 KB Output is correct
2 Correct 2 ms 3932 KB Output is correct
3 Correct 3 ms 3164 KB Output is correct
4 Correct 2 ms 3932 KB Output is correct
5 Correct 2 ms 3932 KB Output is correct
6 Correct 2 ms 3928 KB Output is correct
7 Correct 1 ms 2908 KB Output is correct
8 Correct 1 ms 3164 KB Output is correct
9 Correct 2 ms 3676 KB Output is correct
10 Correct 2 ms 3676 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2908 KB Output is correct
5 Correct 5 ms 9564 KB Output is correct
6 Correct 5 ms 8796 KB Output is correct
7 Correct 2 ms 3676 KB Output is correct
8 Correct 1 ms 3164 KB Output is correct
9 Correct 5 ms 9560 KB Output is correct
10 Correct 2 ms 3416 KB Output is correct
11 Correct 1 ms 3420 KB Output is correct
12 Correct 2 ms 3932 KB Output is correct
13 Correct 3 ms 3164 KB Output is correct
14 Correct 2 ms 3932 KB Output is correct
15 Correct 2 ms 3932 KB Output is correct
16 Correct 2 ms 3928 KB Output is correct
17 Correct 1 ms 2908 KB Output is correct
18 Correct 1 ms 3164 KB Output is correct
19 Correct 2 ms 3676 KB Output is correct
20 Correct 2 ms 3676 KB Output is correct
21 Correct 3 ms 4444 KB Output is correct
22 Correct 174 ms 82256 KB Output is correct
23 Correct 194 ms 123728 KB Output is correct
24 Correct 171 ms 94544 KB Output is correct
25 Correct 199 ms 125264 KB Output is correct
26 Correct 171 ms 106960 KB Output is correct
27 Correct 63 ms 33376 KB Output is correct
28 Correct 82 ms 40272 KB Output is correct
29 Correct 157 ms 73884 KB Output is correct
30 Correct 197 ms 126020 KB Output is correct