제출 #74679

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
74679		kjain_1810	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	3 ms	724 KiB

numbers

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
 
const int MAXL = 25;
const int MAXD = 12;
 
ll dp[MAXL][MAXD][MAXD][2][2];
vector<int> digitos;
int N;
ll A,B;
 
ll solve(int pos,int l1,int l2,int flag,int leading){
	ll &ret = dp[pos][l1][l2][flag][leading];
	if(ret != -1) return ret;
	ret = 0;
	if(pos == N){
		ret = 1;
		return ret;
	}
	int limite = 9;
	if(flag) limite = digitos[pos];
	for(int i = 0;i<=limite;i++){
		if(leading == 1 && i == 0){
			ret += solve(pos+1,l1,l2,flag && (i == limite),leading);
		}
		else{
			if(l1 != i && l2 != i) ret += solve(pos+1,i,l1,flag && (i == limite), 0);
		}
	}
	return ret;
}
 
ll calcula(ll X){
	if(X == -1) return 0;
	if(X == 0) return 1;
	digitos.clear();
	memset(dp,-1,sizeof(dp));
	while(X != 0){
		digitos.push_back(X % 10);
		X /= 10;
	}
	reverse(digitos.begin(),digitos.end());
	N = digitos.size();
	return solve(0,10,10,1,1);
}
 
int main(){
 
	cin >> A >> B;
	cout << calcula(B) - calcula(A-1) << endl;
 
	return 0;
}

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