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Submission #245131

# Submission time Handle Problem Language Result Execution time Memory
245131 2020-07-05T14:42:21 Z HuyQuang_re_Zero Boat (APIO16_boat) C++14
9 / 100
 42 ms 32296 KB 
#include <bits/stdc++.h>
#define ll long long
#define N 2000001
using namespace std;
const ll mod=round(1e9)+7;
ll gt[N],ng[N],sum,f[2001][2001];
long long C(int k,int n)
{
    if(k>n) return 0;
    return gt[n]*ng[k]%mod*ng[n-k]%mod;
}
int i,j,k,n,m;
struct pt { int l,r; };
pt b[N],a[N];
set <int> s;
ll lt(ll a,ll b)
{
    if(b==0) return 1;
    ll tg=lt(a,b/2);
    if(b%2==0) return tg*tg%mod;
    return tg*tg%mod*a%mod;
}
int main()
{
   // freopen("ntu.inp","r",stdin);
    //freopen("ntu.out","w",stdout);
    sum=0;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>a[i].l>>a[i].r;
        s.insert(a[i].l); s.insert(a[i].r);
        sum+=a[i].r-a[i].l+1;
    }
    gt[0]=1;
    for(i=1;i<=sum;i++) gt[i]=gt[i-1]*i%mod;
    ng[sum]=lt(gt[sum],mod-2);
    for(i=sum-1;i>=0;i--) ng[i]=ng[i+1]*(i+1)%mod;
    for(set <int>::iterator it=s.begin();it!=s.end();it++)
    {
        b[++m]={ (*it),(*it) };
        set <int>::iterator it2=it; it2++;
        if(it2!=s.end() && (*it)+1<(*it2)) b[++m]={ (*it)+1,(*it2)-1 };
    }
    for(i=0;i<=n;i++) f[i][0]=1;
    for(i=0;i<=n;i++)
        for(j=1;j<=m;j++)
        {
            f[i][j]=((f[i][j-1]+f[i-1][j])%mod-f[i-1][j-1]+mod)%mod;
            for(k=i;i-k<=b[j].r-b[j].l && k>=1;k--)
            {
                if(a[k].r<b[j].l || a[k].l>b[j].r) break;
                f[i][j]=(f[i][j]+f[k-1][j-1]*C(i-k+1,b[j].r-b[j].l+1))%mod;
            }
          //  cerr<<i<<" "<<j<<" "<<f[i][j]<<'\n';
        }
    cout<<(f[n][m]-1+mod)%mod;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 6272 KB Output is correct
2 Correct 14 ms 6272 KB Output is correct
3 Correct 14 ms 6272 KB Output is correct
4 Correct 14 ms 6272 KB Output is correct
5 Correct 14 ms 6400 KB Output is correct
6 Correct 14 ms 6272 KB Output is correct
7 Correct 14 ms 6400 KB Output is correct
8 Correct 14 ms 6400 KB Output is correct
9 Correct 14 ms 6400 KB Output is correct
10 Correct 14 ms 6272 KB Output is correct
11 Correct 14 ms 6272 KB Output is correct
12 Correct 14 ms 6272 KB Output is correct
13 Correct 15 ms 6272 KB Output is correct
14 Correct 14 ms 6272 KB Output is correct
15 Correct 14 ms 6272 KB Output is correct
16 Correct 7 ms 3072 KB Output is correct
17 Correct 7 ms 3072 KB Output is correct
18 Correct 7 ms 3072 KB Output is correct
19 Correct 8 ms 3072 KB Output is correct
20 Correct 7 ms 3072 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 6272 KB Output is correct
2 Correct 14 ms 6272 KB Output is correct
3 Correct 14 ms 6272 KB Output is correct
4 Correct 14 ms 6272 KB Output is correct
5 Correct 14 ms 6400 KB Output is correct
6 Correct 14 ms 6272 KB Output is correct
7 Correct 14 ms 6400 KB Output is correct
8 Correct 14 ms 6400 KB Output is correct
9 Correct 14 ms 6400 KB Output is correct
10 Correct 14 ms 6272 KB Output is correct
11 Correct 14 ms 6272 KB Output is correct
12 Correct 14 ms 6272 KB Output is correct
13 Correct 15 ms 6272 KB Output is correct
14 Correct 14 ms 6272 KB Output is correct
15 Correct 14 ms 6272 KB Output is correct
16 Correct 7 ms 3072 KB Output is correct
17 Correct 7 ms 3072 KB Output is correct
18 Correct 7 ms 3072 KB Output is correct
19 Correct 8 ms 3072 KB Output is correct
20 Correct 7 ms 3072 KB Output is correct
21 Incorrect 38 ms 21888 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 42 ms 32296 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 6272 KB Output is correct
2 Correct 14 ms 6272 KB Output is correct
3 Correct 14 ms 6272 KB Output is correct
4 Correct 14 ms 6272 KB Output is correct
5 Correct 14 ms 6400 KB Output is correct
6 Correct 14 ms 6272 KB Output is correct
7 Correct 14 ms 6400 KB Output is correct
8 Correct 14 ms 6400 KB Output is correct
9 Correct 14 ms 6400 KB Output is correct
10 Correct 14 ms 6272 KB Output is correct
11 Correct 14 ms 6272 KB Output is correct
12 Correct 14 ms 6272 KB Output is correct
13 Correct 15 ms 6272 KB Output is correct
14 Correct 14 ms 6272 KB Output is correct
15 Correct 14 ms 6272 KB Output is correct
16 Correct 7 ms 3072 KB Output is correct
17 Correct 7 ms 3072 KB Output is correct
18 Correct 7 ms 3072 KB Output is correct
19 Correct 8 ms 3072 KB Output is correct
20 Correct 7 ms 3072 KB Output is correct
21 Incorrect 38 ms 21888 KB Output isn't correct
22 Halted 0 ms 0 KB -