Submission #492253

#	Time	Username	Problem	Language	Result	Execution time	Memory
492253		abc864197532	Skyscraper (JOI16_skyscraper)	C++17	100 / 100	262 ms	84492 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define X first
#define Y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    while (l != r) cout << *l << " \n"[++l == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.X >> a.Y;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.X << ", " << a.Y << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}
template <typename T> struct vv : vector <vector <T>> {
    vv(int n, int m, T v) : vector <vector <T>> (n, vector <T>(m, v)) {}
    vv() {}
};
template <typename T> struct vvv : vector <vv <T>> {
    vvv(int n, int m, int k, T v) : vector <vv <T>> (n, vv <T>(m, k, v)) {}
    vvv() {}
};
#ifdef Doludu
#define test(args...) abc("[" + string(#args) + "]", args)
#define owo freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#else
#define test(args...) void(0)
#define owo ios::sync_with_stdio(false); cin.tie(0)
#endif
const int mod = 1e9 + 7, N = 200001, logC = 30;

int dp[101][101][1001][3];

void add(int &i, int j) {
    i += j;
    if (i >= mod)
        i -= mod;
}

int main () {
    owo;
    int n, l;
    cin >> n >> l;
    vector <int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    if (n == 1) {
        cout << 1 << endl;
        return 0;
    }
    sort(all(a));
    dp[1][1][0][0] = 1;
    dp[1][1][0][1] = 2;
    for (int i = 1; i < n; ++i) for (int cc = 1; cc < n; ++cc) for (int val = 0; val <= l; ++val) for (int j = 0; j < 3; ++j) {
        int nxtcost = val + (a[i] - a[i - 1]) * (cc * 2 - j);
        if (nxtcost > l)
            continue;
        test(nxtcost);
        if (dp[i][cc][val][j])
            test(i, cc, val, j, dp[i][cc][val][j]);
        // add one group
        add(dp[i + 1][cc + 1][nxtcost][j], 1ll * dp[i][cc][val][j] * (cc + 1 - j) % mod);
        // append to one's end
        add(dp[i + 1][cc][nxtcost][j], 1ll * dp[i][cc][val][j] * (cc * 2 - j) % mod);
        // glue two cc
        add(dp[i + 1][cc - 1][nxtcost][j], 1ll * dp[i][cc][val][j] * (cc - 1) % mod);
        // put one side
        if (j < 2) {
            // add one group
            add(dp[i + 1][cc + 1][nxtcost][j + 1], dp[i][cc][val][j] * (j ? 1 : 2) % mod);
            // append to one's end
            add(dp[i + 1][cc][nxtcost][j + 1], dp[i][cc][val][j] * (j ? 1 : 2) % mod);
        }
    }
    int ans = 0;
    for (int i = 0; i <= l; ++i)
        add(ans, dp[n][1][i][2]), test(i, dp[n][1][i][2]);
    cout << ans << endl;
}

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80