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- int fun(int n)
- {
- int ans=0;
- string s;
- while(n>0)
- {
- s.push_back('9'-(n%10));
- n/=10;
- }
- reverse(s.begin(),s.end());
- for(int i=0;i<(int)s.size();i++)
- {
- ans*=10;
- ans+=s[i]-'0';
- }
- return ans;
- }
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