洛谷B2093 B2094 B2095题解

最新推荐文章于 2026-01-05 17:06:32 发布

原创最新推荐文章于 2026-01-05 17:06:32 发布 · 209 阅读

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#python #开发语言

B2093

find方法，查找特定值并返回下标，找不到则返回-1

n = int(input())
Str = input().split()
i = input()
print("".join(Str).find(i))

B2094

n = int(input())
if n == 0:
    print(0)
    exit()
ls = input().split()
lls =[]
lss = []
for i in ls:
    lls.append(eval(i))
M = max(lls)
for j in ls:
    if j != str(M):
        lss.append(eval(j))
print(sum(lss))

注意除0检查

B2095

n = int(input())
if n == 0:
    exit()
ls = []
for _ in range(n):
    Num = float(input())
    ls.append(Num)
mean = sum(ls)/len(ls)
ls.sort(reverse=False)
lls = ls[1:-1]
if len(lls) == 0:
    print(0)
else:
    newmean = sum(lls)/len(lls)
    a = max(abs(i - newmean) for i in lls)
    print(f"{newmean:.2f} {a:.2f}")

题目先理清楚，求误差时注意先求差值，再取绝对值，再取最大。