题解 | 小红的不动点
小红的不动点
https://www.nowcoder.com/practice/ca080ccef283479cb89286c6182fe6bc
hashd = dict()
ans=0
n = int(input())
nums = list(map(int,input().split(" ")))
for num in nums:
if num in hashd:
hashd[num]+=1
elif num not in hashd:
hashd[num] = 1
for i in hashd:
if i == hashd[i]:
ans+=i
print(ans)
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