Onnenluku

#include <iostream>
#include <vector>
#include <string>
#include <set>
#include <utility>
#include <algorithm>
 
using namespace std;
typedef long long LL;
 
int main(){
	LL a,b; cin >> a >> b;
	LL ans = 0;
	for(LL d1 = 1; d1 <= 9; d1++){
		for(LL d2 = d1 + 1; d2 <= 9; d2++){
			for(LL l = 2; l <= 15; l++){
				//if(l == 4) return 0;
				for(LL mask = 1; mask < (1 << l) - 1; mask++){
					LL x = 0;
					LL p = 1;
					for(int i = 0; i < l; i++){
						if(((1 << i) & mask))
							x += p*d1;
						else 
							x += p*d2;
						p *= 10;
					}
					//cout << mask << " " << x << endl;
					if(x >= a && x <= b) ans++;
				}
			}
		}
	}
	cout << ans;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER