不要62

http://acm.hdu.edu.cn/showproblem.php?pid=2089

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;

typedef long long ll;

int a[20];
int dp[20][2];

int dfs(int pos,int pre,int sta,bool limit){
    if(pos==-1)return 1;
    if(!limit&&dp[pos][sta]!=-1)return dp[pos][sta];
    int up=limit?a[pos]:9;
    int tmp=0;
    for(int i=0;i<=up;++i){
        if(pre==6&&i==2)continue;
        if(i==4)continue;
        tmp+=dfs(pos-1,i,i==6,limit&&i==a[pos]);
    }
    if(!limit)dp[pos][sta]=tmp;
    return tmp;
}

int solve(int x){
    int pos=0;
    while(x)
        a[pos++]=x%10,x/=10;
    return dfs(pos-1,-1,0,true);
}

int main(){
    int le,ri;
    memset(dp,-1,sizeof(dp));
    while(~scanf("%d%d",&le,&ri)&&le+ri)
        printf("%d
",solve(ri)-solve(le-1));
    return 0;
}