Submission #4075081

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Source Code Expand

from itertools import accumulate

N = 100000
prime = [True]*(N+1)

prime[0] = prime[1] = False

for i in range(N+1):
    if prime[i]:
        for j in range(2*i, N+1, i):
            prime[j] = False

prime2 = [0] * (N+1)

for i in range(N+1):
    if prime[i] and prime[(i+1)//2]:
        prime2[i] = 1

acc = list(accumulate(prime2))

Q = int(input())
for _ in range(Q):
    l, r = map(int, input().split())
    print(acc[r]-acc[l-1])

Submission Info

Judge Result