32 lines
675 B
Python
32 lines
675 B
Python
m = 15546404183
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def main():
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n = int(input())
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s = input()
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left_rolling_hash = 0
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right_rolling_hash = 0
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pw = 1
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def roll_left(h, l):
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return (h*37+l)%m
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def roll_right(h, l, pw):
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rs = (h+l*pw)%m
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pw = (pw*37)%m
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return rs, pw
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total = 0
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for i in range(n-1):
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left_rolling_hash = roll_left(left_rolling_hash, ord(s[i]))
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right_rolling_hash, pw = roll_right(right_rolling_hash, ord(s[-1-i]), pw)
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if left_rolling_hash == right_rolling_hash:
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total += 1
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# print(left_rolling_hash, right_rolling_hash)
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return total
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for _ in range(int(input())):
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print(main()) |