Submission #6685182


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#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<unordered_set>
#include<unordered_map>
using namespace std;
typedef long long ll;
#define mod 1000000007
#define mad(a,b) a=(a+b)%mod;

int main(){
  ll ans=0;
  ll n; cin>>n;
  for(int i=1;i<=n;i++){
    ll cnt=0;
    ll x=i;
    while(x>0){
      cnt++;
      x/=10;
    }
    if(cnt%2==1)ans++;
  }
  cout<<ans<<endl;
  return 0;
}

Submission Info

Submission Time
Task B - Uneven Numbers
User ynymxiaolongbao
Language C++14 (GCC 5.4.1)
Score 200
Code Size 442 Byte
Status AC
Exec Time 2 ms
Memory 256 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 200 / 200
Status
AC × 3
AC × 13
Set Name Test Cases
Sample a01, a02, a03
All a01, a02, a03, b04, b05, b06, b07, b08, b09, b10, b11, b12, b13
Case Name Status Exec Time Memory
a01 AC 1 ms 256 KB
a02 AC 1 ms 256 KB
a03 AC 2 ms 256 KB
b04 AC 1 ms 256 KB
b05 AC 1 ms 256 KB
b06 AC 1 ms 256 KB
b07 AC 1 ms 256 KB
b08 AC 1 ms 256 KB
b09 AC 1 ms 256 KB
b10 AC 1 ms 256 KB
b11 AC 1 ms 256 KB
b12 AC 2 ms 256 KB
b13 AC 2 ms 256 KB