Submission #1359092

---

Source Code Expand

#include <iostream>
#include <cstring>
using namespace std;
int N[1000005];
char Str[500005];
int nine[1000005], sum, limit;
void Read()
{
    cin.getline(Str, 500005);
    int len = strlen(Str);
    for(int i = len - 1; i >= 0; i--)
    {
        N[++N[0]] = Str[i] - '0';
    }
    limit = N[0];
}

void Add()
{
    int t = 0, i;
    for(i = 1; i <= N[0] || i <= nine[0] || t; i++)
    {
        if(nine[i] == 0 && t == 0)
            break;
        sum -= N[i];
        N[i] = (N[i] + nine[i] + t);
        t = N[i] / 10;
        N[i] %= 10;
        sum += N[i];
    }
    N[0] = i - 1;
}
void mul()
{
      int i, t = 0;
      for (i = 1; i <= N[0] || t; i++, t /= 10)
              N[i] = (t += N[i] * 9) % 10;
      N[0] = i - 1;
      for(int i = 1; i <= N[0]; i++)
        sum += N[i];
}
void Solve()
{
    mul();
    nine[0] = 1;
    nine[1] = 9;
    for(int k = 1; k <= limit; k++)
    {
        Add();
        if(sum <= 9 * k)
        {
            cout << k << "\n";
            return;
        }
    }
}
int main()
{
    Read();
    Solve();
    return 0;
}

Submission Info

Judge Result