HAMTOANLE C++

#include <bits/stdc++.h>
using namespace std;

int a[1000000],b[1000000];
int i,j,k,n,x,s1,s2,s3;
void nhap()
{
    cin>>n;
    for(i=1;i<=n;i++) 
        cin>>a[i];
}
bool kt(int x)
{
    while(x>0)
    {
        int a=x%10;
        x=x/10;
      if(a%2==0) return false;
    }
    return true;
}

void xuli()
{
    for(int i=1;i<=n-2;i++)
    {
        if( kt(a[i])==true && kt(a[i+1])==true && kt(a[i+2])==true )
            cout<<i<<" "<<(i+1)<<" "<<(i+2)<<endl;
    }
}

int main()
{
    freopen("hamtoanle.inp","r",stdin);
    freopen("hamtoanle.out","w",stdout);
    nhap();
    xuli();
}