this program isn't AC (WA test#10) because of the
precision of the answer, but Pascal solution using the
same ideas is AC. If you can help me to deal with the
precision I would be very grateful to you. Still i'd
recommend you to write the problem in Pascal to avoid all
potential precision problems :

#include <iostream>
#include <cmath>

using namespace std;

struct cross{int x,y;};

int main()
{
    int m,n,k,i;
    cross a[100];
    cin >> m >> n >> k;

    if (!k) {cout << 100*(m+n); return 0;}

    for (i=0;i<k;i++) cin >> a[i].x >> a[i].y;

    bool f=false;
    cross t;

    while (!f)
    {
        f=true;
        for (i=0;i<k-1;i++)
            if (a[i].x>a[i+1].x)
                {t=a[i]; a[i]=a[i+1]; a[i+1]=t; f=false;}
            else if (a[i].x==a[i+1].x && a[i].y>a[i+1].y)
                {t=a[i]; a[i]=a[i+1]; a[i+1]=t; f=false;}
    }

    int d[100];
    int mx,j;

    d[k-1]=1;
    for (i=k-2;i>=0;i--)
    {
        d[i]=1; mx=0;
        for (j=k-1;j>i;j--)
            if (a[i].x<a[j].x && a[i].y<a[j].y && d[j]>mx) mx=d[j];
        d[i]+=mx;
    }

    double ans;

    ans=(double)100*((double)m+(double)n-(double)2*d[0]+sqrt((double)2)*(double)d[0]);
    cout << floor(ans+(double).5);

    return 0;
}

So what to do? I've got wa#10 and don't know how properly round the number!!! printf("%.0f",f); doesn't work!!!!

I guess it would be easier to rewrite it in Delphi or Pascal. I didn't manage to find a mistake in my solution.
There're probably big random numbers in the bad test.

Because Pascal is better than your C++(or C)!
Pascal luchshe potomu shto tvoy C++ dibilniy

In fact, I don't think so. I suppouse C++ is more powerfull, but probably test for this problem were made by Pascal program.

I cannot understand why you are so furious about C++.
If you know it well it's surely better than Pascal
(I mean it gives you much more freedom).
The only problem is to learn how to use its power properly.

Well, there are many arguments whether pascal or c++ is better  but I think it depends on the coder. Yet, I prefer C++ mainly because it's more powerful and it has STL which is a great advantage, although that lately I'm getting very fond of Java and once I couldn't solve a problem niether on C, c++ or pascal and I tried Java and suddenly made it :).
So sometimes tests really are made for some language

function Round(X: Extended): Int64;

Description

In Delphi, the Round function rounds a real-type value to an integer-type value.

X is a real-type expression. Round returns an Int64 value that is the value of X rounded to the nearest whole number. If X is exactly halfway between two whole numbers, the result is always the even number. This method of rounding is often called "Banker’s Rounding".

this is very strange try to send this code before changing this fragment
d[k-1]=1;
for (i=k-2;i>=0;i--)
{
d[i]=1; mx=0;
for (j=k-1;j>i;j--)
if (a[i].x<a[j].x && a[i].y<a[j].y && d[j]>mx) mx=d[j];
d[i]+=mx;
}


to

d[0]=1;
for (i=1;i<k;i++)
{
d[i]=1; mx=0;
for (j=0;j<i;j++)
if (a[i].x>a[j].x && a[i].y>a[j].y && d[j]>mx) mx=d[j];
d[i]+=mx;
}

and this fragment

ans=(double)100*((double)m+(double)n-(double)2*d[0]+sqrt((double)2)*(double)d[0]);
cout << floor(ans+(double).5);


to

ans=100.0*(m+n-2*d[k-1])+d[k-1]*sqrt(20000.0);
    cout<<(int)(ans+0.5)<<endl;


and I hope you will get AC


Edited by author 29.01.2009 23:29

Well, I round with:
(int)(a + 0.5 + 1e-9);
When 'a' is the number I need to round.

I think this method is better:

double ans;
/*
...
*/
cout.setf(ios::fixed,ios::floatfield);
cout.precision(0);
cout << ans;