Where is error in my code?

#1

PLease tell me the error in my code

#2

Hey @Ferogle

ll computeMtxExp(ll n){

    if(n<=k){
			return 1;//updated this
    }

    vvl T(k,vll(k));
    T[0][0]=0;T[0][1]=1;T[1][0]=1;T[1][1]=1;


    T=fastMtxExp(T,n-1);

    ll res=0;
    for(int i=0;i<k;i++){
        res=(res+(T[0][i]*b[i])%MOD)%MOD;
    }

    return res;
}
#3

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