Submission #1204348

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;

#define int long long

typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define all(v) (v).begin(),(v).end()
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
#define pb push_back
#define fi first
#define se second
template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

string S;
int mem[22][2];

int dfs(int n,int f){
    if(n==S.size())return 1;
    int &ret=mem[n][f];
    if(ret!=-1)return ret;

    ret=0;
    for(int i=0;i<10;i++){
        if(!f&&S[n]-'0'<i)break;
        if(i==4||i==9)continue;
        ret+=dfs(n+1,f|(S[n]-'0'!=i));
    }
    return ret;
}

string tos(int n){
    stringstream ss;
    ss<<n;
    return ss.str();
}

signed main(){
    int A,B;
    cin>>A>>B;

    int ans=0;
    S=tos(B);
    memset(mem,-1,sizeof(mem));
    ans+=dfs(0,0);
    A--;
    S=tos(A);
    memset(mem,-1,sizeof(mem));
    ans-=dfs(0,0);
    cout<<B-A-ans<<endl;
    return 0;
}

Submission Info

Judge Result