1
2

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?

More than 1 year has passed since last update.

ABC324をPythonで(A~E)

Last updated at Posted at 2023-10-14

日本レジストリサービス(JPRS)プログラミングコンテスト2023(AtCoder Beginner Contest 324)

A問題

setに入れて確認

A
input()
s = list(map(int, input().split()))
print("YNeos"[len(set(s))>1::2])

B問題

2と3で割れるだけ割る

B
n = int(input())
while n % 2 == 0:n //= 2
while n % 3 == 0:n //= 3
print("YNeos"[n>1::2])

C問題

各Sに対して調べる。
1文字差があるときは、1つ以外違うか確認
同じ文字数のときは、同じ場所の違う文字の数が1以下か調べる

C
n, t = input().split()

def check(s, t):
    if len(s) + 1 != len(t):return False
    i = 0
    while i < len(s) and s[i] == t[i]:
        i += 1
    while i < len(s) and s[i] == t[i + 1]:
        i += 1

    return i == len(s)

ans = []
for i in range(int(n)):
    s = input()
    if abs(len(s) - len(t)) == 1:
        if check(s, t) or check(t, s):
            ans.append(i + 1)
    elif len(s) == len(t):
        cnt = sum(s_i != t_i for s_i, t_i in zip(s, t))
        if cnt <= 1:
            ans.append(i + 1)

print(len(ans))
print(*ans)

D問題

10^13未満の平方数は10^7個未満なので
それぞれの平方数について、Sから作れるか調べる。

D
n = int(input())
S = input()
s = [0] * 10
for s_i in S:s[int(s_i)] += 1

i = 0
ans = 0
while i ** 2 < 10 ** n:
    t = [0] * 10
    for t_i in str(i ** 2):
        t[int(t_i)] += 1
    if s[1:] == t[1:]:
        ans += 1
    i += 1

print(ans)

E問題

各Sについて
tを先頭からx文字、後ろからy文字を含んでるとする
この時、すでに見たものの中で
後ろからlen(t)-x文字以上含んでいるもの + 前からlen(t)-y文字以上含んでいるものの総和

E
class BinaryIndexTree:
    def __init__(self, n):
        self.size = n
        self.tree = [0] * (n + 1)

    def sum(self, i):
        s = 0
        while i > 0:
            s += self.tree[i]
            i -= i & -i
        return s

    def add(self, i, x):
        while i <= self.size:
            self.tree[i] += x
            i += i & -i

    def range_sum(self, i, j):
        if i == 0:
            return self.sum(j)
        return self.sum(j) - self.sum(i - 1)


n, t = input().split()
front = BinaryIndexTree(len(t) + 10)
back = BinaryIndexTree(len(t) + 10)
ans = 0
for i in range(int(n)):
    s = input()
    x = 0
    for s_i in s:
        if s_i == t[x]:
            x += 1
        if x == len(t):break
    y = 0
    for s_i in s[::-1]:
        if s_i == t[-y - 1]:
            y += 1
        if y == len(t):break

    # 0だとバグるので+1
    ans += i - front.sum(len(t) - y) + i - back.sum(len(t) - x)
    front.add(x + 1, 1)
    back.add(y + 1, 1)

    i = 0
    for s_i in s + s:
        if i < len(t) and t[i] == s_i:
            i += 1
    if i == len(t):
        ans += 1

print(ans)
1
2
0

Register as a new user and use Qiita more conveniently

  1. You get articles that match your needs
  2. You can efficiently read back useful information
  3. You can use dark theme
What you can do with signing up
1
2

Delete article

Deleted articles cannot be recovered.

Draft of this article would be also deleted.

Are you sure you want to delete this article?