Submission #448492

#	Time	Username	Problem	Language	Result	Execution time	Memory
448492		BT21tata	Palindrome-Free Numbers (BOI13_numbers)	C++17	34.17 / 100	1099 ms	324 KiB

numbers

#include<bits/stdc++.h>
#pragma GCC target ("avx,avx2,fma")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
#define SPEED ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define rall(v) (v).rbegin(),(v).rend()
#define all(v) (v).begin(),(v).end()
#define OK cerr<<"OK"<<endl<<flush
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define F first
#define S second
#define y0 jahdakdh
#define y1 jahsadakdakdh
#define endl '\n'
using namespace std;
const ll MOD=1e9+7;
// mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());
 
ll a, b, p[20];
ll ans;
int check(int x)
{
    string s=to_string(x);
    int n=s.length();
    s+='-';
    for(int i=0; i<n-1; i++)
    {
        if(s[i]==s[i+1]) return n-(i+1)-1;
        else if(s[i]==s[i+2]) return n-(i+2)-1;
    }
    return -1;
}

int main()
{
    SPEED;
    p[0]=1;
    for(int i=1; i<=18; i++)
        p[i]=p[i-1]*10;
    cin>>a>>b;
    for(int i=a; i<=b;)
    {
        int e=check(i);
        if(e==-1) ans++, e++;
        //cout<<i<<' '<<e<<endl;
        i=(i/p[e]*p[e])+p[e];
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 22.5 / 25
• Subtask 2: 11.666666666666666 / 75