class Solution: def isUnique(self , str: str) -> bool: # write code here res_dic = {} for i in str: if i not in res_dic: res_dic[i] = 1 else: res_dic[i] += 1 for v in res_dic.values(): if v > 1: return False return True
class Solution:
def isUnique(self , str: str) -> bool:
# write code here
d={}
for i in str:
if i in d.keys():
d[i]+=1
else:
d[i]=1
a=[v for (k,v) in d.items() if v>1]
return True if len(a)==0 else False