#define PI2 6.283185307179586476925286766559
#include <iostream>
#include <math.h>
using namespace std;

void main(){
    int N, i;
    float R, x[100], y[100], L;
    L=0.0f;
    cin>>N>>R;
    if (N==0){ cout<<"0"; return;}
    for(i=0; i<N; i++){
        cin>>float(x[i])>>float(y[i]);
        if (i) L+=sqrt( (x[i-1]-x[i])*(x[i-1]-x[i])+(y[i-1]-y[i])*(y[i-1]-y[i]) );
    }
    L+=sqrt( (x[i-1]-x[0])*(x[i-1]-x[0])+(y[i-1]-y[0])*(y[i-1]-y[0]) );
    L+=PI2*R;
    if (N==1) L=PI2*R;
    L*=100;
    L=int(L);
    L/=100;
    cout<<L;
}

On my tests, it works ok. The length is truncated, not rounded. It works for 0, 1, 2, ... nails. I can't see what's wrong. And it's getting quite frustrating.
If someone could help me with an idea as to why i get WA on test 3, I would remain in their debt.
Thanks.

Use this for writing result:

printf("%.2f", L);

instead of

L*=100;
L=int(L);
L/=100;
cout<<L;

Edited by author 18.12.2006 03:23

Whew!! Thanks a lot. It worked. I had the same issue in another problem. I'll change there, too.
Again, thank you very much.

Thank U!!!!!))
I has WA because of
L*=100;
L=int(L);
L/=100;
cout<<L;
not printf()
))

what's wrong with this ?

var n,k: byte;
    r,x0,y0,x1,y1,x,y: Real;
    s: real;
begin
  readln(n,r);
  s:=r*6.28;
  if n=0 then s:=0;
  if n=2 then
  begin
    readln(x0,y0);
    readln(x1,y1);
    s:=s+2*sqrt(sqr(x1-x0)+sqr(y1-y0));
  end;
  if n>2 then
  begin
    readln(x0,y0);
    x:=x0;
    y:=y0;
    for k:=1 to n-1 do
    begin
      readln(x1,y1);
      s:=s+sqrt(sqr(x1-x0)+sqr(y1-y0));
      x0:=x1;
      y0:=y1;
    end;
    s:=s+sqrt(sqr(x-x0)+sqr(y-y0));
  end;
  writeln(int(s*100)/100:0:2);
end.

i got WA on test #3

i tried
writeln(s:0:2); also, got WA


Edited by author 21.10.2009 00:48