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はじめに

前回
今日もCです。今日で例題は終わりです。

#16

考えたこと
ABC049-C
ぜんぜん分からなかったので、解説を見ました。ふむふむ、文字列を逆にすればerの区別しなくていいのか。
文字列を逆にしたあとは、ひたすらif文にしてます。

s = str(input())
s = ''.join(list(reversed(s)))

t = 0
while t <= len(s):
    if s[t:t+5] == 'maerd':
        t += 5
        continue
    elif s[t:t+7] == 'remaerd':
        t += 7
        continue
    elif s[t:t+5] == 'esare':
        t += 5
        continue
    elif s[t:t+6] == 'resare':
        t += 6
        continue
    elif t == len(s):
        print('YES')
        quit()
    else:
        break
print('NO')

Python3 → 33ms
PyPy3 → 189ms
スライス処理はPyPyよりもPythonの方が早い?


ABC086-C
(0,0)から(x,y)に移動するときに必要なマンハッタン距離?をdとすると、t>=dなら時間内に到着できます。また、(d - t) % 2 == 0ならば、t未満で到着しても隣りのマスと目的のマスを往復できるので、t時に到着可能です。

n = int(input())
l = [list(map(int,input().split())) for _ in range(n)]

for i in range(n):
    t = l[i][0]
    x = l[i][1]
    y = l[i][2]
    d = x + y
    if d <= t and (d - t) % 2 == 0:
        continue
    else:
        print('No')
        quit()
print('Yes')

Python3 → 369ms
PyPy3 → 585ms

まとめ

今回で例題は全部解いたので、次回からは類題を解いていきます!
では、また

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