Submission #502822

#	Time	Username	Problem	Language	Result	Execution time	Memory
502822		NintsiChkhaidze	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	4 ms	4580 KiB

numbers

#include <bits/stdc++.h>
#define pb push_back
#define s second
#define f first
#define ll long long
#define int ll
using namespace std;
 
string str;
int dp[20][20][55][5][5];
 
int get(int last2 = 10,int last = 10,int pos = 0,int sm = 0,int p = 1){
    if (pos >= str.size()) return dp[last2][last][pos][sm][p] = 1;
    if (dp[last2][last][pos][sm][p] != -1) 
        return dp[last2][last][pos][sm][p];
    
    int l = 9,sum=0;
    if (!sm) l = str[pos] - '0';
    for (int i=0;i<=l;i++){
        if (i == last || i == last2) continue;
        int sm2 = sm,p2 = p;
        if (!sm2 && i < l) sm2 = 1;
        if (i && p2) p2 = 0;
        if (p2) sm2 = 1;
        if (p2) sum += get(10,10,pos+1,sm2,p2);
        else sum += get(last,i,pos + 1,sm2,p2);
    }
    
    return dp[last2][last][pos][sm][p] = sum;
}
int check(string a){
    for (int i = 1; i < a.size(); i++){
        if (a[i] == a[i - 1]) return 0;
        if (i > 1 && a[i] == a[i - 2]) return 0;
    }
    return 1;
}
int G(string a){
    str = a;
    memset(dp, -1, sizeof(dp));
    return get();
}
signed main (){
    ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
    string a,b;
    cin>>a>>b;
    cout<<G(b) - G(a) + check(a)<<"\n";
}

Compilation message (stderr)

numbers.cpp: In function 'long long int get(long long int, long long int, long long int, long long int, long long int)':
numbers.cpp:13:13: 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]
   13 |     if (pos >= str.size()) return dp[last2][last][pos][sm][p] = 1;
      |         ~~~~^~~~~~~~~~~~~
numbers.cpp: In function 'long long int check(std::string)':
numbers.cpp:32:23: 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]
   32 |     for (int i = 1; i < a.size(); i++){
      |                     ~~^~~~~~~~~~

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