public NucleotideSum Process(char nucleotide)
{
NucleotideSum next = this;
switch (nucleotide)
{
case 'A': next.A++; break;
case 'C': next.C++; break;
case 'G': next.G++; break;
case 'T': next.T++; break;
}
return(next);
}
public int[] Solution(string S, int[] P, int[] Q)
{
NucleotideSum[] prefix = new NucleotideSum[S.Length + 1];
prefix[1] = prefix[1].Process(S[0]);
for (int i = 2; i < S.Length + 1; i++)
{
prefix[i] = prefix[i - 1].Process(S[i - 1]);
}
int[] result = new int[P.Length];
for (int i = 0; i < result.Length; i++)
{
int q = Q[i] + 1;
int p = P[i];
result[i] = prefix[q].GetMinimalImpactFactor(prefix[p]);
}
return(result);
}
public int GetMinimalImpactFactor(NucleotideSum previousSum)
{
if (A - previousSum.A != 0)
{
return(GetImpactFactor('A'));
}
if (C - previousSum.C != 0)
{
return(GetImpactFactor('C'));
}
if (G - previousSum.G != 0)
{
return(GetImpactFactor('G'));
}
if (T - previousSum.T != 0)
{
return(GetImpactFactor('T'));
}
return(0);
}
