Submission #230433

#	Time	Username	Problem	Language	Result	Execution time	Memory
230433		mehrdad_sohrabi	Palindrome-Free Numbers (BOI13_numbers)	C++14	100 / 100	5 ms	512 KiB

numbers

#include <bits/stdc++.h>
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pii pair < ll , ll >
#define F first
#define S second
#define endl '\n'
#define int long long
#define sync ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("unroll-loops")
#define kill(x) return cout<<x<<'\n', 0;
using namespace std;
const int N=20,M=10;
bool check(vector <int> a){
    for (int i=1;i<a.size();i++){
        if (a[i]==a[i-1]) return 0;
    }
    for (int i=2;i<a.size();i++){
        if (a[i]==a[i-2]) return 0;
    }
    return 1;
}
ll dp[N];
ll p[N];
ll solve(ll x){
    if (x<10) return x+1;
    vector <int> a;
    ll k=x;
    while(k){
        a.pb(k%10);
        k/=10;
    }
    ll ans=0;
    ll z=a.size();
    reverse(a.begin(),a.end());
    vector <int> b;
    for (int i=0;i<a.size();i++){
        z--;

        for (int j=0;j<a[i];j++){
            if (i==0 && j==0) continue;
            b.pb(j);
            if (check(b)){
                if (i==0){
                    ans+=p[z]/8*9;
                   // cout << p[z]/8*9 << endl;;
                    b.pop_back();
                    continue;
                }
                ans+=p[z];
             //   cout << p[z] << endl;
            }
            b.pop_back();
        }
        b.pb(a[i]);
    }
    if (check(b)) ans++;
    ans+=dp[(ll)a.size()-1];
    return ans;

}
int32_t main(){
    p[0]=1;
    for (int i=1;i<N;i++){
        p[i]=p[i-1]*8;
    }
    dp[0]=1;
    dp[1]=10;
    for (int i=2;i<N;i++){
        dp[i]=dp[i-1]+9*9*p[i-2];
    }
    ll l,r;
    cin >> l >> r;
    ll ans=solve(r);
  //  cout << ans << endl;
    if (l!=0) ans-=solve(l-1);
    cout << ans << endl;
}

Compilation message (stderr)

numbers.cpp: In function 'bool check(std::vector<long long int>)':
numbers.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=1;i<a.size();i++){
                  ~^~~~~~~~~
numbers.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=2;i<a.size();i++){
                  ~^~~~~~~~~
numbers.cpp: In function 'll solve(ll)':
numbers.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0;i<a.size();i++){
                  ~^~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 75 / 75