UVa: 12527 (Different Digits)



// http://uva.onlinejudge.org/external/125/12527.html
// Runtime: 0.008
// Tag: Simple math 

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream>
#include <cmath>
#include <bitset>
#include <utility>
#include <set>
#include <numeric>
#include <ctime>

#define Inf 2147483647
#define Pi acos(-1.0)
#define N 50000
#define LL long long

inline LL Power(int b, int p) { LL ret = 1; for ( int i = 1; i <= p; i++ ) ret *= b; return ret; }
const int dr [] = {-1, -1, 0, 1, 1, 1, 0, -1};
const int dc [] = {0, 1, 1, 1, 0, -1, -1, -1};

#define F(i, a, b) for( int i = (a); i < (b); i++ )
#define Fs(i, sz) for( size_t i = 0; i < sz.size (); i++ )
#define Fe(i, x) for(typeof (x.begin()) i = x.begin(); i != x.end (); i++)
#define Set(a, s) memset(a, s, sizeof (a))
#define max(a, b)  (a < b ? b : a)
#define min(a, b)  (a > b ? b : a)

using namespace std;

int accuVal [5000 + 10];

bool hasRepeated(int p)
{
	bool freq [10 + 5];
	Set (freq, false);

	int mod;
	while ( p ) {
		mod = p % 10;
		if ( freq [mod] ) return false;
		freq [mod] = true;
		p /= 10;
	}

	return true;
}

void preGenerate() 
{
	Set (accuVal, 0);

	for ( int i = 1; i <= 5000; i++ ) {
		accuVal [i] = accuVal [i - 1] + (hasRepeated (i) ? 1 : 0);
	}
}

int main () 
{
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);

	preGenerate();

	int n, m;

	while ( scanf ("%d %d", &n, &m) != EOF ) {
		printf ("%d\n", accuVal [m] - accuVal [n - 1]);
	}

	return 0;
}

// @END_OF_SOURCE_CODE
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