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  1. #include <iostream>
  2. #include<vector>
  3. #include<fstream>
  4. using namespace std;
  5. vector<int> v;
  6. int n=0;
  7. int n2=0;
  8. void numero(){
  9.     int s=1;
  10.     for(int i=v.size()-1;i>-1;i--){
  11.         n+=v[i]*s;
  12.         s*=10;
  13.     }
  14. }
  15. void numero2(){
  16.     int d=1;
  17.     for(int i=0;i<v.size();i++){
  18.         if(v[i]==6)
  19.             v[i]=9;
  20.         else if(v[i]==9)
  21.             v[i]=6;
  22.         n2+=v[i]*d;
  23.         d*=10;
  24.     }
  25. }
  26. int main() {
  27.     ifstream in;
  28.     ofstream ou;
  29.     in.open("input.txt");
  30.     ou.open("output.txt");
  31.     char a;
  32.     int b;
  33.     bool tre=true;
  34.     while(!in.eof()){
  35.         in>>a;
  36.         a-=48;
  37.         v.push_back(a);
  38.         b=a;
  39.         if(b==4||b==7)
  40.             tre=false;
  41.     }
  42.     numero();
  43.     numero2();
  44.     if(tre==true&&n2<n)
  45.         ou<<n2;
  46.     else
  47.         ou<<n;
  48.     return 0;
  49. }
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