Language: C++

#include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;
typedef long long ll;
 
ll ppow[15];
int main() { 
	ppow[0] = 1;
	for (int i = 1; i < 15; i++)ppow[i] = ppow[i - 1] * 10;
	ll D; scanf("%lld", &D);
	ll ans = 0;
	rep(a, 10)rep(b, 10) {
		if ((ppow[9] - ppow[8])*(a - b) == D)ans += 9 * ppow[7];
		if ((ppow[9] - ppow[7])*(a - b) == D)ans += 9 * ppow[7];
		if (b && (ppow[1] - ppow[0])*(a - b) == D)ans++;
		if (b && (ppow[2] - ppow[0])*(a - b) == D)ans += 10;
		rep(c, 10)rep(d, 10) {
			if ((ppow[9] - ppow[6])*(a - b) + (ppow[8] - ppow[7])*(c - d) == D)ans += 9 * ppow[5];
			if ((ppow[9] - ppow[5])*(a - b) + (ppow[8] - ppow[6])*(c - d) == D)ans += 9 * ppow[5];
			if (b && (ppow[3] - ppow[0])*(a - b) + (ppow[2] - ppow[1])*(c - d) == D)ans++;
			if (b && (ppow[4] - ppow[0])*(a - b) + (ppow[3] - ppow[1])*(c - d) == D)ans += 10;
			rep(e, 10)rep(f, 10) {
				if ((ppow[9] - ppow[4])*(a - b) + (ppow[8] - ppow[5])*(c - d) + (ppow[7] - ppow[6])*(e - f) == D)ans += 9 * ppow[3];
				if ((ppow[9] - ppow[3])*(a - b) + (ppow[8] - ppow[4])*(c - d) + (ppow[7] - ppow[5])*(e - f) == D)ans += 9 * ppow[3];
				if (b && (ppow[5] - ppow[0])*(a - b) + (ppow[4] - ppow[1])*(c - d) + (ppow[3] - ppow[2])*(e - f) == D)ans++;
				if (b && (ppow[6] - ppow[0])*(a - b) + (ppow[5] - ppow[1])*(c - d) + (ppow[4] - ppow[2])*(e - f) == D)ans += 10;
				rep(g, 10)rep(h, 10) {
					if ((ppow[9] - ppow[2])*(a - b) + (ppow[8] - ppow[3])*(c - d) + (ppow[7] - ppow[4])*(e - f) + (ppow[6] - ppow[5])*(g - h) == D)ans += 9;
					if ((ppow[9] - ppow[3])*(a-b)
					if (b && (ppow[7] - ppow[0])*(a - b) + (ppow[6] - ppow[1])*(c - d) + (ppow[5] - ppow[2])*(e - f) + (ppow[4] - ppow[3])*(g - h) == D)ans++;
					if (b && (ppow[8] - ppow[0])*(a - b) + (ppow[7] - ppow[1])*(c - d) + (ppow[6] - ppow[2])*(e - f) + (ppow[5] - ppow[3])*(g - h) == D)ans += 10;
					rep(i,10)rep(j,10){
						
					}
				}
			}
		}
	}
	printf("%lld\n", ans);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:70: error: expected ';' before 'if'
   29 |                                         if ((ppow[9] - ppow[3])*(a-b)
      |                                                                      ^
      |                                                                      ;
   30 |                                         if (b && (ppow[7] - ppow[0])*(a - b) + (ppow[6] - ppow[1])*(c - d) + (ppow[5] - ppow[2])*(e - f) + (ppow[4] - ppow[3])*(g - h) == D)ans++;
      |                                         ~~                            
a.cc:31:41: error: expected primary-expression before 'if'
   31 |                                         if (b && (ppow[8] - ppow[0])*(a - b) + (ppow[7] - ppow[1])*(c - d) + (ppow[6] - ppow[2])*(e - f) + (ppow[5] - ppow[3])*(g - h) == D)ans += 10;
      |                                         ^~
a.cc:30:179: error: expected ')' before 'if'
   30 |                                         if (b && (ppow[7] - ppow[0])*(a - b) + (ppow[6] - ppow[1])*(c - d) + (ppow[5] - ppow[2])*(e - f) + (ppow[4] - ppow[3])*(g - h) == D)ans++;
      |                                                                                                                                                                                   ^
      |                                                                                                                                                                                   )
   31 |                                         if (b && (ppow[8] - ppow[0])*(a - b) + (ppow[7] - ppow[1])*(c - d) + (ppow[6] - ppow[2])*(e - f) + (ppow[5] - ppow[3])*(g - h) == D)ans += 10;
      |                                         ~~                                                                                                                                         
a.cc:29:44: note: to match this '('
   29 |                                         if ((ppow[9] - ppow[3])*(a-b)
      |                                            ^