#include <iostream.h>
#include <math.h>

int main(){
    int N, R;
    cin>>N>>R;
    int i;
    double t1_x, t2_x, tf_x, t1_y, t2_y, tf_y;
    cin>>tf_x>>tf_y;
    t1_x=tf_x;
    t1_y=tf_y;
    double sum_l=0;
    for(i=1; i<N; i++){
        cin>>t2_x>>t2_y;
        sum_l+=sqrt((t2_x-t1_x)*(t2_x-t1_x)+(t2_y-t1_y)*(t2_y-t1_y));
        t1_x=t2_x;
        t1_y=t2_y;
    }
    if (N>1)
        sum_l+=sqrt((t2_x-tf_x)*(t2_x-tf_x)+(t2_y-tf_y)*(t2_y-tf_y));

    int sum=int((sum_l+2*R*2*acos(0))*100);
    cout<<double(sum)/100;
    return 0;
}

#include <iostream>
using namespace std;

NOT
#include <iostream.h>

I know my mistake. I tryed to count acos(0), but 0 is int and acos has double parameters. I changed to acos(0.0)

Edited by author 01.06.2004 20:20

Edited by author 01.06.2004 20:27