th];
int index;
overlay_function[0] = -1;
for(int i=1;i {
index = overlay_function[i-1];
//store previous fail position k to index;
while(index>=0 && pattern[i]!=pattern[index+1])
{
index = overlay_function[index];
}
if(pattern[i]==pattern[index+1])
{
overlay_function[i] = index + 1;
}
else
{
overlay_function[i] = -1;
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