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Submission #47974

# Submission time Handle Problem Language Result Execution time Memory
47974 2018-05-09T09:43:00 Z 3zp Boat (APIO16_boat) C++14
9 / 100
 40 ms 9212 KB 
#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll a[5009], b[5009];
ll mod = 1e9+7;
ll c[2009];
ll l[5009], r[5009];
ll dp[5009][4009];
ll in[5009];
vector<pair<ll,ll> > d;
main(){
    ll n;
    cin >> n;
    for(ll i = 0; i < n; i++){
        cin >> a[i] >> b[i];
        c[2*i] = a[i];
        c[2*i + 1] = b[i];
    }
    sort(c, c+2*n);
    in[0] = 1;
    in[1] = 1;
    for (ll i = 2; i <= n; i++)
        in[i] = in[mod % i] *(mod - mod / i) % mod;
    for(ll i = 0; i < 2*n; i++){
        if(i < 2*n-1 && c[i] == c[i+1]) continue;
        d.push_back({c[i], c[i]});
        if(i == 2*n-1 || c[i+1] == c[i]+1) continue;
        d.push_back({c[i]+1, c[i+1]-1});
    }
    for (ll i= 0; i < n; i++){
        for (ll j = 0; j < d.size(); j++){
            if(a[i] == d[j].first) {l[i] = j; break;}
        }
        for (ll j = 0; j < d.size(); j++){
            if(b[i] == d[j].second) r[i] = j;
        }
    }
    ll N = d.size();
    for(ll i = 0; i < n; i++){
        for(ll j = 0; j < N; j++){
            if(j) dp[i][j] = (dp[i][j-1]);
            ll L = d[j].second - d[j].first + 1;
            ll W = 1;
            for (ll t = i; t >= 0; t--){
                if(l[t] > j || r[t] < j) break;
                W = (W*(L - (i -t)) % mod )*in[i-t+1] % mod;
                if(!W) break;
                if(t == 0) dp[i][j] = (dp[i][j] + W) % mod; else
                if(j == 0) dp[i][j] = (dp[i][j] + W) % mod; else
                dp[i][j] = (dp[i][j] + W*dp[t-1][j-1]) % mod;

            }
        }

        for(ll j = 0; j < N; j++){

            if(i) dp[i][j] = (dp[i][j] + dp[i-1][j]) % mod;
            else dp[i][j] = (dp[i][j] + 1) % mod;
        }
    }
    cout << (dp[n-1][N-1] -1 + mod)% mod << endl;
    return 0;
}

Compilation message

boat.cpp:11:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
boat.cpp: In function 'int main()':
boat.cpp:31:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (ll j = 0; j < d.size(); j++){
                        ~~^~~~~~~~~~
boat.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (ll j = 0; j < d.size(); j++){
                        ~~^~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 6392 KB Output is correct
2 Correct 15 ms 6392 KB Output is correct
3 Correct 15 ms 6392 KB Output is correct
4 Correct 15 ms 6452 KB Output is correct
5 Correct 15 ms 6452 KB Output is correct
6 Correct 15 ms 6452 KB Output is correct
7 Correct 15 ms 6452 KB Output is correct
8 Correct 15 ms 6452 KB Output is correct
9 Correct 15 ms 6528 KB Output is correct
10 Correct 15 ms 6528 KB Output is correct
11 Correct 15 ms 6584 KB Output is correct
12 Correct 15 ms 6584 KB Output is correct
13 Correct 15 ms 6584 KB Output is correct
14 Correct 15 ms 6584 KB Output is correct
15 Correct 15 ms 6584 KB Output is correct
16 Correct 6 ms 6584 KB Output is correct
17 Correct 6 ms 6584 KB Output is correct
18 Correct 6 ms 6584 KB Output is correct
19 Correct 6 ms 6584 KB Output is correct
20 Correct 6 ms 6584 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 6392 KB Output is correct
2 Correct 15 ms 6392 KB Output is correct
3 Correct 15 ms 6392 KB Output is correct
4 Correct 15 ms 6452 KB Output is correct
5 Correct 15 ms 6452 KB Output is correct
6 Correct 15 ms 6452 KB Output is correct
7 Correct 15 ms 6452 KB Output is correct
8 Correct 15 ms 6452 KB Output is correct
9 Correct 15 ms 6528 KB Output is correct
10 Correct 15 ms 6528 KB Output is correct
11 Correct 15 ms 6584 KB Output is correct
12 Correct 15 ms 6584 KB Output is correct
13 Correct 15 ms 6584 KB Output is correct
14 Correct 15 ms 6584 KB Output is correct
15 Correct 15 ms 6584 KB Output is correct
16 Correct 6 ms 6584 KB Output is correct
17 Correct 6 ms 6584 KB Output is correct
18 Correct 6 ms 6584 KB Output is correct
19 Correct 6 ms 6584 KB Output is correct
20 Correct 6 ms 6584 KB Output is correct
21 Incorrect 40 ms 9212 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 9212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 6392 KB Output is correct
2 Correct 15 ms 6392 KB Output is correct
3 Correct 15 ms 6392 KB Output is correct
4 Correct 15 ms 6452 KB Output is correct
5 Correct 15 ms 6452 KB Output is correct
6 Correct 15 ms 6452 KB Output is correct
7 Correct 15 ms 6452 KB Output is correct
8 Correct 15 ms 6452 KB Output is correct
9 Correct 15 ms 6528 KB Output is correct
10 Correct 15 ms 6528 KB Output is correct
11 Correct 15 ms 6584 KB Output is correct
12 Correct 15 ms 6584 KB Output is correct
13 Correct 15 ms 6584 KB Output is correct
14 Correct 15 ms 6584 KB Output is correct
15 Correct 15 ms 6584 KB Output is correct
16 Correct 6 ms 6584 KB Output is correct
17 Correct 6 ms 6584 KB Output is correct
18 Correct 6 ms 6584 KB Output is correct
19 Correct 6 ms 6584 KB Output is correct
20 Correct 6 ms 6584 KB Output is correct
21 Incorrect 40 ms 9212 KB Output isn't correct
22 Halted 0 ms 0 KB -