Q=int(input())
mod=67280421310721
for _ in range(Q):
  N=int(input())
  S=input()
  x100=[1]*(N+1)
  for i in range(1,N+1):
    x100[i]=x100[i-1]*100
    x100[i]%=mod
  v=[0]*N
  w=0
  for i in range(N):
    w*=100
    w%=mod
    x=ord(S[i])-ord('a')
    w+=x+1
    w%=mod
    v[i]=w
  result=0
  for i in range(1,N):
    l=0
    r=min(i,N-i)
    r2=r
    while True:
      m=(l+r+1)//2
      a=v[m-1]
      b=v[i+m-1]-v[i-1]*(x100[m])
      b%=mod
      if a==b:
        l=m
      else:
        r=m-1
      if l==r:
        break
    if l==r2:
      if N>2*i:
        result+=1
    else:
      p=ord(S[l])
      q=ord(S[i+l])
      if p<q:
        result+=1
  print(result)