True title of Blue Bridge Cup: Card [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Title Description

This question is to fill in the blanks , Just calculate the result , Use the output statement in the code to output the filled results .

Xiaolan has a lot of digital cards , There are numbers on every card 0 To 9. Xiao Lan is going to use these cards to spell some numbers , He wants to start with 1 Start spelling positive integers , Each one , Just keep it , Cards can't be used to spell other numbers . Xiao Lan wants to know that she can learn from 1 How much do you spell . for example , When little blue has 30 Cards , among 0 To 9 various 3 Zhang , Then Xiaolan can spell 11 To 1010, But it's hard to 11 Time cards 1 There's only one left , It's not enough to spell 11. Now Xiaolan has 0 To 9 All the cards are 2021 Zhang , common 20210 Zhang , May I ask Xiao Lan how to get it from 1 How much do you spell ？ Tips ： Computer programming is recommended to solve the problem

Operation limit

• Maximum operation time ：1s
• Maximum running memory : 128M

The violence is over , Pure simulation , But note that the boundary condition is -1 instead of 0：

#include <bits/stdc++.h>
using namespace std;
vector<int> num(2020,2021);

bool check(int n)
{
  while(n)
  {
    num[n%10]--;
    if(num[n%10]==-1) return false;
    n/=10;
  }
  return true;
}


int main()
{
  //  Please enter your code here 
  int ans=1;
  while(check(ans))
  {
    ans++;
  }
  cout<<ans-1;
  // cout<<3181;
  return 0;
}

Copy

The answer is 3181

Publisher ： Full stack programmer stack length , Reprint please indicate the source ：https://javaforall.cn/126489.html Link to the original text ：https://javaforall.cn