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Submission #47972

# Submission time Handle Problem Language Result Execution time Memory
47972 2018-05-09T09:40:42 Z 3zp Boat (APIO16_boat) C++14
9 / 100
 43 ms 9440 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 (int 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(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 6264 KB Output is correct
2 Correct 15 ms 6372 KB Output is correct
3 Correct 15 ms 6588 KB Output is correct
4 Correct 15 ms 6588 KB Output is correct
5 Correct 15 ms 6588 KB Output is correct
6 Correct 15 ms 6588 KB Output is correct
7 Correct 15 ms 6588 KB Output is correct
8 Correct 15 ms 6588 KB Output is correct
9 Correct 15 ms 6588 KB Output is correct
10 Correct 15 ms 6676 KB Output is correct
11 Correct 15 ms 6704 KB Output is correct
12 Correct 15 ms 6704 KB Output is correct
13 Correct 14 ms 6704 KB Output is correct
14 Correct 15 ms 6704 KB Output is correct
15 Correct 16 ms 6784 KB Output is correct
16 Correct 7 ms 6784 KB Output is correct
17 Correct 6 ms 6784 KB Output is correct
18 Correct 6 ms 6784 KB Output is correct
19 Correct 6 ms 6784 KB Output is correct
20 Correct 7 ms 6784 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 6264 KB Output is correct
2 Correct 15 ms 6372 KB Output is correct
3 Correct 15 ms 6588 KB Output is correct
4 Correct 15 ms 6588 KB Output is correct
5 Correct 15 ms 6588 KB Output is correct
6 Correct 15 ms 6588 KB Output is correct
7 Correct 15 ms 6588 KB Output is correct
8 Correct 15 ms 6588 KB Output is correct
9 Correct 15 ms 6588 KB Output is correct
10 Correct 15 ms 6676 KB Output is correct
11 Correct 15 ms 6704 KB Output is correct
12 Correct 15 ms 6704 KB Output is correct
13 Correct 14 ms 6704 KB Output is correct
14 Correct 15 ms 6704 KB Output is correct
15 Correct 16 ms 6784 KB Output is correct
16 Correct 7 ms 6784 KB Output is correct
17 Correct 6 ms 6784 KB Output is correct
18 Correct 6 ms 6784 KB Output is correct
19 Correct 6 ms 6784 KB Output is correct
20 Correct 7 ms 6784 KB Output is correct
21 Incorrect 43 ms 9440 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 9440 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 6264 KB Output is correct
2 Correct 15 ms 6372 KB Output is correct
3 Correct 15 ms 6588 KB Output is correct
4 Correct 15 ms 6588 KB Output is correct
5 Correct 15 ms 6588 KB Output is correct
6 Correct 15 ms 6588 KB Output is correct
7 Correct 15 ms 6588 KB Output is correct
8 Correct 15 ms 6588 KB Output is correct
9 Correct 15 ms 6588 KB Output is correct
10 Correct 15 ms 6676 KB Output is correct
11 Correct 15 ms 6704 KB Output is correct
12 Correct 15 ms 6704 KB Output is correct
13 Correct 14 ms 6704 KB Output is correct
14 Correct 15 ms 6704 KB Output is correct
15 Correct 16 ms 6784 KB Output is correct
16 Correct 7 ms 6784 KB Output is correct
17 Correct 6 ms 6784 KB Output is correct
18 Correct 6 ms 6784 KB Output is correct
19 Correct 6 ms 6784 KB Output is correct
20 Correct 7 ms 6784 KB Output is correct
21 Incorrect 43 ms 9440 KB Output isn't correct
22 Halted 0 ms 0 KB -