oj.uz

Submission #199280

# Submission time Handle Problem Language Result Execution time Memory
199280 2020-01-30T22:21:21 Z osaaateiasavtnl Boat (APIO16_boat) C++14
0 / 100
 326 ms 8696 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
const int N = 507, MOD = 1000 * 1000 * 1000 + 7;
int mod(int n) {
    n %= MOD;
    if (n < 0) return n + MOD;
    else return n;
}   
int fp(int a, int p) {
    int ans = 1, c = a;
    for (int i = 0; (1ll << i) <= p; ++i) {
        if ((p >> i) & 1) ans = mod(ans * c);
        c = mod(c * c);
    }   
    return ans;
}   
int dv(int a, int b) { return mod(a * fp(b, MOD - 2)); }
void addmod(int &a, int b) {
    a = mod(a + b);
}   
int C(int n, int k) {
    int a = 1;
    for (int i = n; i > n - k; --i)
        a = mod(a * i);
    int b = 1;
    for (int i = 1; i <= k; ++i)
        b = mod(b * i);
    return dv(a, b);
}   
int n, l[N], r[N], dp[N][N], mem[N][N];
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    for (int i = 0; i < N; ++i)
        mem[i][0] = 1;
    for (int i = 1; i < N; ++i)
        for (int j = 1; j < N; ++j)
            mem[i][j] = mod(mem[i - 1][j] + mem[i - 1][j - 1]);
    cin >> n;
    vector <int> c;
    for (int i = 1; i <= n; ++i) {
        cin >> l[i] >> r[i];
        c.app(l[i]); c.app(r[i] + 1);
    }                                
    sort(all(c));
    c.resize(unique(all(c)) - c.begin());
    dp[0][0] = 1;
    for (int i = 0; i + 1 < (int)c.size(); ++i) {
        for (int j = 0; j <= n; ++j) {
            addmod(dp[i + 1][j], dp[i][j]);
            for (int k = j + 1; k <= n; ++k) {
                int ptr = k;
                while (ptr > j && l[ptr] <= c[i] && c[i + 1] - 1 <= r[ptr])
                    --ptr;
                for (int cnt = 1; cnt <= k - ptr; ++cnt) {
                    addmod(dp[i + 1][k], mod(dp[i][j] * mem[k - ptr - 1][cnt - 1]) * C(c[i + 1] - c[i], cnt));
                }   
            }
        }   
    }
    /*
    int ans = 0;
    for (int i = 1; i <= n; ++i)
        addmod(ans, dp[c.size() - 1][i]);
    cout << ans << '\n';
    */
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Runtime error 326 ms 8696 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Runtime error 326 ms 8696 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 106 ms 3320 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Runtime error 326 ms 8696 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -