ABC143 - Atcoder/Python精進のための解説メモ

a, b = map(int, input().split())
print(a - b * 2 if a > b * 2 else 0)

n = int(input())
d = list(map(int, input().split()))
ctn = 0
for i in range(n):
    for j in range(i + 1, n):
        ctn += d[i] * d[j]
print(ctn)

from itertools import groupby

def run_length_encode(s: str) -> "List[tuple(str, int)]":
    grouped = groupby(s)
    res = []
    for k, v in grouped:
        res.append((k, int(len(list(v)))))
    return res

n = int(input())
print(len(run_length_encode(input())))

n = int(input())
s = input()
ans = n
for i in range(1, n):
    if s[i - 1] != s[i]:
        continue
    ans -= 1
print(ans)

まだ解いていません