oj.uz

Submission #558427

# Submission time Handle Problem Language Result Execution time Memory
558427 2022-05-07T09:55:02 Z hoanghq2004 Boat (APIO16_boat) C++14
0 / 100
 4 ms 4564 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const int N = 510;
const int mod = 1e9 + 7;

int n, f[N][N], g[N][N], C[N][N];
int L[N], R[N];

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

int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> n;
    vector <int> dta = {0};
    for (int i = 1; i <= n; ++i) {
        cin >> L[i] >> R[i];
        --L[i];
        dta.push_back(L[i]), dta.push_back(R[i]);
    }
    sort(dta.begin(), dta.end());
    dta.erase(unique(dta.begin(), dta.end()), dta.end());
    int m = dta.size();
    C[0][0] = 1;
    for (int i = 1; i < N; ++i) {
        C[i][0] = 1;
        for (int j = 1; j <= i; ++j)
            C[i][j] = (C[i - 1][j] + C[i - 1][j - 1]) % mod;
    }
    for (int i = 0; i <= n; ++i) f[i][0] = 1;
    for (int s = 1; s < m; ++s) {
        int d = dta[s] - dta[s - 1];
        for (int i = 0; i <= n; ++i) {
            for (int j = 0; j <= i; ++j) {
                g[s][i] = 1LL * C[i][j] * C[d][j] % mod;
            }
        }
    }
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j < m; ++j) {
            f[i][j] = f[i][j - 1];
            int cnt = 0;
            for (int k = i; k > 0; --k) {
                cnt += (L[k] < dta[j] && dta[j] <= R[k]);
                add(f[i][j], 1LL * f[k - 1][j - 1] * g[j][cnt] % mod);
            }
        }
    }
    cout << f[n][m - 1];
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 4 ms 4564 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Runtime error 4 ms 4564 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 2 ms 2888 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Runtime error 4 ms 4564 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -