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class Solution {
public:
 
        int digit(int n)
        {
            int mx=0;
            int mn=9;
 
            while(n>0)
            {
                int d = n % 10;
                mx = max(mx, d);
                mn = min(mn, d);
 
                n=n/10;
            }
            return mx - mn;
        }
 
    int maxDigitRange(vector<int> b)
    {
        int best = 0;
 
        for(int x: b)
        {
            best = max(best , digit(x));
        }
 
        int a = 0;
        for(int x: b)
        {
            if(digit(x) == best)
            {
                a = a + x;
            }
        }
        return a;
    }
 
};

prog.cpp:20:23: error: ‘vector’ has not been declared
     int maxDigitRange(vector<int> b)
                       ^~~~~~
prog.cpp:20:29: error: expected ‘,’ or ‘...’ before ‘<’ token
     int maxDigitRange(vector<int> b)
                             ^
prog.cpp: In member function ‘int Solution::digit(int)’:
prog.cpp:12:22: error: ‘max’ was not declared in this scope
                 mx = max(mx, d);
                      ^~~
prog.cpp:12:22: note: suggested alternative: ‘mx’
                 mx = max(mx, d);
                      ^~~
                      mx
prog.cpp:13:22: error: ‘min’ was not declared in this scope
                 mn = min(mn, d);
                      ^~~
prog.cpp:13:22: note: suggested alternative: ‘mn’
                 mn = min(mn, d);
                      ^~~
                      mn
prog.cpp: In member function ‘int Solution::maxDigitRange(int)’:
prog.cpp:24:20: error: ‘b’ was not declared in this scope
         for(int x: b)
                    ^
prog.cpp:26:20: error: ‘max’ was not declared in this scope
             best = max(best , digit(x));
                    ^~~
prog.cpp:30:20: error: ‘b’ was not declared in this scope
         for(int x: b)
                    ^

Standard output is empty