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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int long long
  4. using i128 = __int128_t;
  5.  
  6. i128 make_num(int digit, int len) {
  7.     i128 num = 0;
  8.     for(int i = 0; i < len; i++)
  9.         num = num * 10 + digit;
  10.     return num;
  11. }
  12.  
  13. i128 abs128(i128 x){
  14.     return x < 0 ? -x : x;
  15. }
  16.  
  17. signed main() {
  18.     ios::sync_with_stdio(false);
  19.     cin.tie(nullptr);
  20.  
  21.     int f, n;
  22.     cin >> f >> n;
  23.  
  24.     vector<int> v(2);
  25.     cin >> v[0] >> v[1];
  26.  
  27.     int a = v[0];
  28.     int b = v[1];
  29.  
  30.     i128 x = make_num(a, n);
  31.     i128 y = make_num(b, n);
  32.  
  33.     i128 z = a;
  34.     for(int i = 1; i < n; i++)
  35.         z = z * 10 + b;
  36.  
  37.     i128 p = b;
  38.     for(int i = 1; i < n; i++)
  39.         p = p * 10 + a;
  40.  
  41.     i128 q = make_num(b, n - 1);
  42.     i128 r = make_num(a, n + 1);
  43.  
  44.     i128 F = f;
  45.  
  46.     i128 ans = min({
  47.         abs128(F - x),
  48.         abs128(F - y),
  49.         abs128(F - z),
  50.         abs128(F - p),
  51.         abs128(F - q),
  52.         abs128(F - r)
  53.     });
  54.  
  55.     cout << (long long)ans << '\n';
  56.  
  57.     return 0;
  58. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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4
0 2
0 1
11 2
1 2
222 2
3 4
3333 2
6 7
stdout
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2
https://ideone.com/v5RP7e
language:
C++ (gcc 8.3)
created:
14 hours ago
visibility:
public

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