Submission

Score: 20

User: mocngaijakraila

Problemset: Strobogrammatic Numbers

Language: cpp

Time: 1.097 second

Submitted On: 2026-06-07 10:54:40

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

bool f(ll i, ll j, string t) {
    while(i <= j) {
        if((t[i] == '1' && t[j] ==  '1') || (t[i] == '0' && t[j] == '0') || (t[i] == '8' && t[j] == '8') || (t[i] == '6' && t[j] == '9') || (t[i] == '9' && t[j] == '6')) {

            i++;
            j--;
        }
        else {
            return false;
        }
    }

    return true;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);

    ll l, u;
    cin >> l >> u;

    ll cnt = 0;

    while(l <= u) {

        auto t = to_string(l);


        int i = 0, j = t.length()-1;

        if(f(i, j, t)) cnt++;

        l++;



    }
    cout << cnt;


    return 0;
}