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Submission #704012

# Submission time Handle Problem Language Result Execution time Memory
704012 2023-03-01T11:12:36 Z Pacybwoah Magneti (COCI21_magneti) C++14
10 / 110
 1 ms 468 KB 
#include<iostream>
#include<vector>
#define ll long long
using namespace std;
const ll mod=1e9+7;
ll power(ll a,ll b){
    if(b==0) return 1;
    if(b&1) return power(a,b-1)*a%mod;
    ll tmp=power(a,b/2);
    return tmp*tmp%mod;
}
ll inverse(ll a){
    return power(a,mod-2);
}
int main(){
    ll n,l;
    cin>>n>>l;
    vector<ll> vec(n);
    vector<ll> fac(20001);
    fac[0]=1;
    for(ll i=1;i<=20000;i++) fac[i]=fac[i-1]*i%mod;
    for(int i=0;i<n;i++) cin>>vec[i];
    bool flag=1;
    for(int i=0;i<n-1;i++){
        if(vec[i]!=vec[i+1]){
            flag=0;
            break;
        }
    }
    if(flag){
        ll r=vec[0];
        ll k=(l-1-(n-1)*r);
        if(k<0){
            cout<<0;
            return 0;
        }
        cout<<fac[k+n]*inverse(fac[n])%mod*inverse(fac[k])%mod*fac[n]%mod;
        return 0;
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 424 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 428 KB Output is correct
10 Correct 1 ms 468 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 468 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 424 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 428 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Incorrect 1 ms 468 KB Output isn't correct
12 Halted 0 ms 0 KB -