如何计算SAR指标的k线数量

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//|                Copyright ?2004, metaQuotes Software Corp. |
//|                           http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright Copyright ?2004, metaQuotes Software Corp.
#property link      http://www.metaquotes.net/

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_color1 Lime
//---- input parameters
extern double    Step=0.02;
extern double    Maximum=0.2;
//---- buffers
double SarBuffer[];
//----
int    save_lastreverse;
bool   save_dirlong;
double save_start;
double save_last_high;
double save_last_low;
double save_ep;
double save_sar;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                  |
//+------------------------------------------------------------------+
int init()
   {
//---- indicators
    SetIndexStyle(0,DRAW_ARROW);
    SetIndexArrow(0,159);
    SetIndexBuffer(0,SarBuffer);
//----
    return(0);
   }
//+------------------------------------------------------------------+
//|                                             |
//+------------------------------------------------------------------+
void SaveLastReverse(int last,int dir,double start,double low,double high,double ep,double sar)
   {
    save_lastreverse=last;
    save_dirlong=dir;
    save_start=start;
    save_last_low=low;
    save_last_high=high;
    save_ep=ep;
    save_sar=sar;
   }
//+------------------------------------------------------------------+
//| Parabolic Sell And Reverse system                     |
//+------------------------------------------------------------------+
int start()
   {
    static bool first=true;
    bool   dirlong;
    double start,last_high,last_low;
    double ep,sar,price_low,price_high,price;
    int    i,counted_bars=IndicatorCounted();
//----
    if(Bars0)
       {
        save_lastreverse=i;
        price_low=Low[i];
        if(last_low price_low)   last_low=price_low;
        price_high=High[i];
        if(last_highHigh[i+1] price_low Low[i+1]) break;
        if(price_high
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