```
public class Solution {
public int numberOfArithmeticSlices(int[] A) {
if(A.length<3)
return 0;
int streak=0,diff=0,ret=0;
if((A[1]-A[0])==(A[2]-A[1]))
{
++streak;
}
diff = A[2]-A[1];
for(int i=2;i<A.length-1;i++)
{
if((A[i]-A[i-1])==(A[i+1]-A[i]))
{
if(diff == (A[i+1]-A[i]))
{
++streak;
}
else
{
diff = (A[i+1]-A[i]);
streak=1;
}
}
else
{
ret = ret + ((streak * (streak+1))/2);
streak=0;
}
}
ret = ret + ((streak * (streak+1))/2);
return ret;
}
}
```