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| def find(s): | |
| res,start,cur = [],1,s[0] | |
| for index,i in enumerate(s): | |
| if i != cur: | |
| res.append((start,index)) | |
| start = index + 1 | |
| cur = i | |
| res.append((start,len(s))) | |
| return res |
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