Tuenti Contest 13 (Pablo Moreno)

/*
    Author: Pablo Moreno Olalla
    Email address: darthbrevu@yahoo.es
*/
#include <cstdio>
#include <string>
#include <numeric>
#include <sstream>
#include <iostream>

using namespace std;

unsigned long long initial=36;  //Six zeros. From here, we add the delta for each second.

unsigned long long transitions[]={0,4,1,1,2,1,1,4,0,1};
unsigned long long transition50=2;
unsigned long long transition30=2;
unsigned long long transition20=2;

unsigned long long accum10,accum6,accum4,accum2_;

unsigned long long accumx[6];
unsigned long long times[]={36000,3600,600,60,10};

inline void initA() {
    accum10=accumulate(&transitions[0],&transitions[10],0);
    accum6=accumulate(&transitions[0],&transitions[5],transition50);
    accum4=accumulate(&transitions[0],&transitions[3],transition30);
    accum2_=transitions[0]+transitions[1]+transition20;
    accumx[0]=8786*accum10+1464*accum6+accum2_+accum4;
    accumx[1]=3661*accum10+610*accum6;
    accumx[2]=366*accum10+61*accum6;
    accumx[3]=61*accum10+10*accum6;
    accumx[4]=6*accum10+accum6;
    accumx[5]=accum10;
}

unsigned long long totalLeds(unsigned long long secs)   {
    unsigned long long res=initial;
    unsigned long long d=secs/86400;
    secs%=86400;
    unsigned long q;
    res+=d*accumx[0];
    for (size_t i=0;i<5;++i)    {
        q=secs/times[i];
        secs%=times[i];
        res+=accumulate(&transitions[0],&transitions[q],q*accumx[i+1]);
    }
    return accumulate(&transitions[0],&transitions[secs],res);
}

int main(int argc,char **argv)  {
    //The first two lines are not strictly necessary, but make the code a little more handy.
    if (argc>=2) freopen(argv[1],"r",stdin);
    if (argc>=3) freopen(argv[2],"w",stdout);
    initA();
    string tmp;
    unsigned long long ull;
    do  {
        getline(cin,tmp);
        istringstream iss(tmp);
        iss>>ull;
        if (!iss.fail()) cout<<totalLeds(ull)<<endl;
    }   while (!cin.eof());
    return 0;
}