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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#184315 | #6793. Chiaki Sequence | ucup-team004# | AC ✓ | 2111ms | 91468kb | Python3 | 2.1kb | 2023-09-20 16:46:50 | 2023-09-20 16:46:51 |
Judging History
answer
a = [1, 2]
s = {1}
v = 1
K = 700
pre = [0]
for i in range(2, K) :
if i % 2 == 0 :
a.append(a[i - 1] * 2)
else :
while v in s :
v += 1
a.append(a[i - 1] + v)
# print(v)
for j in range(i) :
s.add(a[i] - a[j])
P = 10 ** 9 + 7
pre = [0]
for i in range(K) :
pre.append((pre[i] + a[i]) % P)
# print(a[len(a) - 1])
# print(10 ** 100)
s = list(s)
s.sort()
# print(s)
seg = []
for i in range(1, len(s)) :
if s[i] > s[i - 1] + 1 :
seg.append((s[i - 1] + 1, s[i]))
inv2 = pow(2, P - 2, P)
def calc(n) :
return 2 * pow(inv2, n % (P - 1), P) * (P - n % P - 1 + pow(2, n % (P - 1), P)) % P
m = len(seg)
while seg[m - 1][0] > 10 ** 101 :
seg.pop()
m -= 1
pre1 = [0]
pre2 = [0]
cnt = [0]
for i in range(m) :
(l, r) = seg[i]
t = cnt[i]
s1 = (r - l) * (l + r - 1) // 2 * (P - 3) % P
s2 = calc(r - l) * pow(inv2, t % (P - 1), P) % P
s2 = (s2 + l * 2 * (1 - pow(inv2, (r - l) % (P - 1), P) + P) * pow(inv2, t % (P - 1), P)) % P
pre1.append((pre1[i] + s1) % P)
pre2.append((pre2[i] + s2) % P)
cnt.append(cnt[i] + r - l)
T = int(input())
for _ in range(T) :
n = int(input())
if n <= K :
print(pre[n])
else :
v = (n - K) // 2
s1 = pre[K]
s2 = a[K - 1] * 4 % P
s1 = (s1 + a[K - 1] * (P - 4)) % P
if n % 2 == 1 :
s2 = (s2 + a[K - 1] * 2) % P
lo = 0
hi = m - 1
while lo < hi :
x = (lo + hi + 1) // 2
if cnt[x] <= v :
lo = x;
else :
hi = x - 1
s1 = (s1 + pre1[lo]) % P
s2 = (s2 + pre2[lo] * (2 + n % 2)) % P
t = cnt[lo]
(l, r) = seg[lo]
r = l + v - t
s1 = (s1 + (r - l) * (l + r - 1) // 2 * (P - 3)) % P
s2 = (s2 + calc(r - l) * pow(inv2, t, P) * (2 + n % 2)) % P
s2 = (s2 + l * 2 * (1 - pow(inv2, r - l, P) + P) * pow(inv2, t, P) * (2 + n % 2)) % P
ans = (s1 + s2 * pow(2, v, P)) % P
print(ans)
Details
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Test #1:
score: 100
Accepted
time: 2086ms
memory: 91468kb
input:
11 1 2 3 4 5 6 7 8 9 10 1000000000
output:
1 3 7 15 31 52 94 145 247 359 834069170
result:
ok 11 lines
Test #2:
score: 0
Accepted
time: 2111ms
memory: 91448kb
input:
1000 822981260158260522 28316250877914575 779547116602436426 578223540024979445 335408917861648772 74859962623690081 252509054433933447 760713016476190629 919845426262703497 585335723211047202 522842184971407775 148049062628894325 84324828731963982 354979173822804784 1312150450968417 269587449430302...
output:
402022187 461557706 192243935 823942920 825501319 5661468 745813676 94702210 711442549 154526807 393243809 290927990 514237755 235285820 334619351 449545285 182465559 618080214 987942678 381954645 191695479 477442291 234477766 62692133 478109339 898101048 334537080 97017450 777256759 79451012 294963...
result:
ok 1000 lines