Submission #201770

#	Time	Username	Problem	Language	Result	Execution time	Memory
201770		EmmanuelAC	Zapina (COCI20_zapina)	C++14	110 / 110	359 ms	2452 KiB

zapina

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
#define pii pair<int,int>
#define pll pair<long long,long long>
using namespace std;

ll n,dp[350][350],mod=7+1e9,C[350][350];
bool use[350][350];

ll coeff(ll N,ll K){
    if( K==0 || K==N ) return 1;
    if( C[N][K] ) return C[N][K];
    return C[N][K] = (coeff( N-1 , K-1 ) + coeff( N-1 , K ) )%mod;
}

ll expBin( ll A , ll B ){
    if( !B ) return 1LL;
    ll myAns = expBin( A , B/2 );
    myAns = (myAns*myAns)%mod;
    if( B&1 ) myAns = (myAns*A)%mod;
    return myAns;
}

ll fn( ll pos , ll T ){
    if( !pos || !T ) return 0LL;
    if( use[pos][T] ) return dp[pos][T];
    use[pos][T] = true;
    ll myAns = 0LL;
    if( pos <= T ){
        myAns = ( coeff( T , pos )*expBin( pos-1 , T-pos ) )%mod;
    }
    for(ll i=0; i<=T; i++){
        if( i==pos ) continue;
        myAns = ( myAns + ((coeff( T , i )*fn( pos-1 , T-i ))%mod) )%mod;
    }

    return dp[pos][T] = myAns;
}

int main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n;
    cout << fn( n , n );

    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55