Submission #782510


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define each(itr,c) for(__typeof(c.begin()) itr=c.begin(); itr!=c.end(); ++itr)
#define all(x) (x).begin(),(x).end()
#define mp make_pair
#define pb push_back
#define fi first
#define se second

const ll mod = 1000000007;

//nPr
ll mod_perm(ll n, ll r)
{
    ll ret=1;
    rep(i,r) (ret*=n-i)%=mod;
    return ret;
}

//逆元
ll mod_inv(ll n)
{
    ll pw[32];

    pw[0]=n%mod;
    for(int i=1; i<32; ++i) pw[i]=(pw[i-1]*pw[i-1])%mod;

    ll ret=1;
    ll x=mod-2;
    rep(i,32) if(x>>i&1) (ret*=pw[i])%=mod;

    return ret;
}

int main()
{
    int n;
    cin >>n;
    vector<ll> a(n);
    rep(i,n) cin >>a[i];

    ll ans=1;

    int st=0;
    while(st<n)
    {
        int ed=st+1;
        while(ed<n && a[ed]==-1) ++ed;

        if(ed>=n) break;

        ll X=a[st], Y=a[ed], L=ed-st-1;
        if(L>0)
        {
            (ans*=mod_perm(Y-X+L,L))%=mod;
            (ans*=mod_inv(mod_perm(L,L)))%=mod;
        }

        st=ed;
    }

    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task C - タコヤ木
User imulan
Language C++11 (GCC 4.8.1)
Score 100
Code Size 1171 Byte
Status AC
Exec Time 29 ms
Memory 1052 KB

Judge Result

Set Name Sample Subtask1 Subtask2 Subtask3
Score / Max Score 0 / 0 50 / 50 30 / 30 20 / 20
Status
AC × 3
AC × 14
AC × 26
AC × 36
Set Name Test Cases
Sample sample_01.txt, sample_02.txt, sample_03.txt
Subtask1 sample_01.txt, sample_02.txt, subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt
Subtask2 sample_01.txt, sample_02.txt, subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask2_01.txt, subtask2_02.txt, subtask2_03.txt, subtask2_04.txt, subtask2_05.txt, subtask2_06.txt, subtask2_07.txt, subtask2_08.txt, subtask2_09.txt, subtask2_10.txt, subtask2_11.txt, subtask2_12.txt
Subtask3 subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask2_01.txt, subtask2_02.txt, subtask2_03.txt, subtask2_04.txt, subtask2_05.txt, subtask2_06.txt, subtask2_07.txt, subtask2_08.txt, subtask2_09.txt, subtask2_10.txt, subtask2_11.txt, subtask2_12.txt, subtask3_01.txt, subtask3_02.txt, subtask3_03.txt, subtask3_04.txt, subtask3_05.txt, subtask3_06.txt, subtask3_07.txt, subtask3_08.txt, subtask3_09.txt, subtask3_10.txt, subtask3_11.txt, subtask3_12.txt
Case Name Status Exec Time Memory
sample_01.txt AC 27 ms 1044 KB
sample_02.txt AC 24 ms 1044 KB
sample_03.txt AC 24 ms 1052 KB
subtask1_01.txt AC 27 ms 936 KB
subtask1_02.txt AC 27 ms 940 KB
subtask1_03.txt AC 26 ms 1048 KB
subtask1_04.txt AC 26 ms 1048 KB
subtask1_05.txt AC 26 ms 1052 KB
subtask1_06.txt AC 27 ms 920 KB
subtask1_07.txt AC 25 ms 1040 KB
subtask1_08.txt AC 26 ms 920 KB
subtask1_09.txt AC 25 ms 936 KB
subtask1_10.txt AC 26 ms 1048 KB
subtask1_11.txt AC 29 ms 1052 KB
subtask1_12.txt AC 25 ms 964 KB
subtask2_01.txt AC 26 ms 1048 KB
subtask2_02.txt AC 26 ms 1048 KB
subtask2_03.txt AC 27 ms 1044 KB
subtask2_04.txt AC 28 ms 936 KB
subtask2_05.txt AC 28 ms 1048 KB
subtask2_06.txt AC 28 ms 940 KB
subtask2_07.txt AC 26 ms 1040 KB
subtask2_08.txt AC 28 ms 1048 KB
subtask2_09.txt AC 29 ms 940 KB
subtask2_10.txt AC 28 ms 940 KB
subtask2_11.txt AC 26 ms 936 KB
subtask2_12.txt AC 27 ms 1044 KB
subtask3_01.txt AC 26 ms 1048 KB
subtask3_02.txt AC 24 ms 940 KB
subtask3_03.txt AC 25 ms 936 KB
subtask3_04.txt AC 27 ms 1048 KB
subtask3_05.txt AC 27 ms 1044 KB
subtask3_06.txt AC 27 ms 964 KB
subtask3_07.txt AC 27 ms 1044 KB
subtask3_08.txt AC 26 ms 1040 KB
subtask3_09.txt AC 27 ms 1044 KB
subtask3_10.txt AC 28 ms 1048 KB
subtask3_11.txt AC 25 ms 1044 KB
subtask3_12.txt AC 26 ms 924 KB