UVa 637 - Booklet Printing

#include <bits/stdc++.h>
#define LL  long long
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define REP(i,n) for(int i=0;i<n;i++)
#define REP(i,n) for(int i=n-1;i>=0;i--)
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define pri(a) cout<<a<<endl
#define prii(a,b) cout<<a<<" "<<b<<endl
#define hi printf("Hello World\n")
#define WRITE(fn) freopen(fn, "w", stdout);
#define pcs printf("Case %d: ", ++cs);
using namespace std;

/// Think a real world situation. you are told to print a book of sheets. as you need to use 1 press sheet
/// for 4 pages. so take required sheets ceil(n/4.0) . count totalpage in takne sheet.
/// loop from your last sheet to frst sheet.. if u're on sheet that's greater than our input sheet nmbr then leave it blank
/// *** Think Real World; Assume yourself a printsman."" The problem is solved"

int main()
{
    int n;

    while(cin>>n and n)
    {
        if(n==1)
        {
             printf("Printing order for %d pages:\n", n);
             printf("Sheet 1, front: Blank, 1\n");
             continue;
        }

        int ReqSheet = ceil(n/4.0);

        int TotalPageInSheet = ReqSheet * 4;

        printf("Printing order for %d pages:\n", n);

        int lst = TotalPageInSheet;
        int fst = 1;

        FOR(i,1,ReqSheet)
        {
            printf("Sheet %d, front: ", i);

            if(lst > n)
                printf("Blank, ");
            else
                printf("%d, ",lst);

            printf("%d\n", fst);

            lst--;
            fst++;

            printf("Sheet %d, back : ", i);

            printf("%d", fst);

            if(lst > n)
                printf(", Blank\n");
            else
                printf(", %d\n",lst);

            lst--;
            fst++;
        }
    }
    return 0;
}