static void Main(string[] args)
{
BigInteger count = 0;
string pattern = Console.ReadLine();
string text = Console.ReadLine();
int n = text.Length;
int m = pattern.Length;
Hash.ComputePowers(m);
var prefix = pattern.Substring(0, 1);
var suffix = pattern.Substring(1, m - 1);
Hash hprefix = new Hash(prefix);
Hash hsuffix = new Hash(suffix);
Hash hPrefixWindowGeneral = new Hash(text.Substring(0, 1));
Hash hSuffixWindowGeneral = new Hash(text.Substring(0, m - 1));
var suffixes = new List<Hash>();
var prefixes = new List<Hash>();
var hWindowsPrefixes = new List<Hash>();
var hWindowSuffixes = new List<Hash>();
for (int i = 1; i <= m; i++)
{
suffixes.Add(new Hash(pattern.Substring(0, i)));
prefixes.Add(new Hash(pattern.Substring(i, m - i)));
hWindowsPrefixes.Add(new Hash(text.Substring(0, i)));
hWindowSuffixes.Add(new Hash(text.Substring(0, m - i)));
}
for (int i = 1; i <= n; i++)
{
hPrefixWindow.Add(text[i + j - 1]);
hPrefixWindow.Remove(text[i - 1], j);
if (hprefix.Value == hPrefixWindow.Value)
{
prefixCount++;
}
}
for (int j = 1; j <= m; j++)
{
long prefixCount = 0;
long suffixCount = 0;
Hash hPrefixWindow = new Hash();
hPrefixWindow.Value = hPrefixWindowGeneral.Value;
Hash hSuffixWindow = new Hash();
hSuffixWindow.Value = hSuffixWindowGeneral.Value;
if (hprefix.Value == hPrefixWindow.Value)
{
prefixCount++;
}
if (hsuffix.Value == hSuffixWindow.Value)
{
suffixCount++;
}
//for prefix
for (int i = 1; i <= n - j; i++)
{
hPrefixWindow.Add(text[i + j - 1]);
hPrefixWindow.Remove(text[i - 1], j);
if (hprefix.Value == hPrefixWindow.Value)
{
prefixCount++;
}
}
//for suffix
if (j != m)
{
for (int i = 1; i <= n - (m - j); i++)
{
hSuffixWindow.Add(text[i + (m - j) - 1]);
hSuffixWindow.Remove(text[i - 1], (m - j));
if (hsuffix.Value == hSuffixWindow.Value)
{
suffixCount++;
}
}
}
else
{
suffixCount = 1;
}
count += (prefixCount * suffixCount);
// change prefix and suffix hash
if (m != j)
{
hprefix.Add(pattern[j]);
hsuffix.Remove(pattern[j], m - j - 1);
hPrefixWindowGeneral.Add(text[j]);
hSuffixWindowGeneral.Remove(text[j], m - j - 1);
}
}
Console.WriteLine(count);
}
static void Main()
{
var reader = new StreamReader("../../input/1.txt");
Console.SetIn(reader);
string pattern = Console.ReadLine();
string text = Console.ReadLine();
int n = text.Length;
int m = pattern.Length;
prefixes = new ulong[m];
suffixes = new ulong[m];
Hash.ComputePowers(m);
Hash hpattern = new Hash(string.Empty);
Hash suffPattern = new Hash(string.Empty);
for (int subLen = 1; subLen <= m; subLen++)
{
hpattern.AddToBack(pattern[subLen - 1]);
suffPattern.AddToFront(pattern[m - subLen], subLen);
Hash hwindow = new Hash(text.Substring(0, subLen));
if (hpattern.Value == hwindow.Value)
{
prefixes[m - subLen - 1]++;
}
if (suffPattern.Value == hwindow.Value)
{
suffixes[m - subLen - 1]++;
}
for (int i = 0; i < n - m; i++)
{
hwindow.AddToBack(text[i + subLen]);
hwindow.Remove(text[i], subLen);
if (hpattern.Value == hwindow.Value)
{
prefixes[subLen - 1]++;
}
if (suffPattern.Value == hwindow.Value)
{
suffixes[subLen - 1]++;
}
}
}
BigInteger result = 0;
for (int i = 0; i < m - 1; i++)
{
result += prefixes[i] * suffixes[i];
}
result += prefixes[m - 1];
Console.WriteLine(result);
}
