Submission #1016329

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016329		delwar_03_	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	1 ms	604 KiB

numbers

#include <bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
const int mod = 1e9 + 7;
const int N = 1e5 + 10;

int dp[20][12][12][2][2]; // (ind, prv, cur, tight, started)

void solve() {
    int l, r; cin>>l>>r;
    string s;

    function<int(int, int, int, int, int)> magic = [&] (int ind, int prv, int cur, int tight, int started) {
        if(ind == s.size()) return 1LL;

        int &ans = dp[ind][prv][cur][tight][started];
        if(~ans) return ans;

        ans = 0;
        int mx = tight ? s[ind] - '0' : 9;

        for(int i = 0; i <= mx; i++) {
            if(i == 0 && !started) {
                ans += magic(ind + 1, prv, cur, tight & (i == mx), 0);
            } else if(i != prv && i != cur) {
                ans += magic(ind + 1, cur, i, tight & (i == mx), 1);
            }
        }

        return ans;
    };


    auto cnt = [&] (int n) {
        s = to_string(n);
        int ans = 0;
        memset(dp, -1, sizeof dp);
        ans += magic(0, 10, 10, 1, 0);
        return ans;
    };

    cout<<cnt(r) - cnt(l - 1)<<endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    int t = 1, c = 1; //cin>>t;
    while(t--) {
        // cerr<<"Case "<<c++<<": \n";
        solve();
    }
}

/*
i/p: 
o/p: 
*/

Compilation message (stderr)

numbers.cpp: In lambda function:
numbers.cpp:15:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         if(ind == s.size()) return 1LL;
      |            ~~~~^~~~~~~~~~~
numbers.cpp: In function 'int main()':
numbers.cpp:51:16: warning: unused variable 'c' [-Wunused-variable]
   51 |     int t = 1, c = 1; //cin>>t;
      |                ^

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