题解 | #字符统计#
字符统计
https://www.nowcoder.com/practice/c1f9561de1e240099bdb904765da9ad0
string = input().strip()
sta = dict()
for c in string:
if c in sta:
sta[c] -= 1
else:
sta[c] = -1
new_sta = sorted(sta.items(), key= lambda x: (x[1], x[0])) # 其实前面正数统计的话这里x[1]前加个负号也行
out = ''
for i in new_sta:
out += i[0]
print(out)
#刷题#
