fibosir_100_PUNCTE

#include <fstream>
#include <algorithm>
#include <cstring>
#define Nmax 500
#define Rmax 420000
using namespace std;

class InParser
{
private:
    FILE *fin;
    char *buff;
    int sp;

    char read_ch()
    {
        ++sp;
        if(sp==4096)
        {
            sp=0;
            fread(buff,1,4096,fin);
        }
        return buff[sp];
    }

public:
    InParser(const char* nume)
    {
        fin=fopen(nume,"r");
        buff=new char[4096]();
        sp=4095;
    }

    InParser& operator >> (int &n)
    {
        char c;
        while(!isdigit(c=read_ch())&&c!='-');
        int sgn=1;
        if (c=='-')
        {
            n=0;
            sgn=-1;
        }
        else
        {
            n=c-'0';
        }
        while(isdigit(c=read_ch()))
        {
            n=10*n+c-'0';
        }
        n*=sgn;
        return *this;
    }

    InParser& operator >> (long long &n)
    {
        char c;
        n=0;
        while(!isdigit(c=read_ch())&&c!='-');
        long long sgn=1;
        if(c=='-')
        {
            n=0;
            sgn=-1;
        }
        else
        {
            n=c-'0';
        }
        while(isdigit(c=read_ch()))
        {
            n=10*n+c-'0';
        }
        n*=sgn;
        return *this;
    }
};

class OutParser
{
private:
    FILE *fout;
    char *buff;
    int sp;

    void write_ch(char ch)
    {
        if(sp==500000)
        {
            fwrite(buff,1,500000,fout);
            sp=0;
            buff[sp++]=ch;
        }
        else
        {
            buff[sp++]=ch;
        }
    }

public:
    OutParser(const char* name)
    {
        fout=fopen(name,"w");
        buff=new char[500000]();
        sp=0;
    }
    ~OutParser()
    {
        fwrite(buff,1,sp,fout);
        fclose(fout);
    }

    OutParser& operator <<(int vu32)
    {
        if(vu32<=9)
        {
            write_ch(vu32+'0');
        }
        else
        {
            (*this) <<(vu32/10);
            write_ch(vu32%10+'0');
        }
        return *this;
    }

    OutParser& operator <<(long long vu64)
    {
        if(vu64<=9)
        {
            write_ch(vu64+'0');
        }
        else
        {
            (*this) <<(vu64/10);
            write_ch(vu64%10+'0');
        }
        return *this;
    }

    OutParser& operator <<(char ch)
    {
        write_ch(ch);
        return *this;
    }
    OutParser& operator <<(const char *ch)
    {
        while(*ch)
        {
            write_ch(*ch);
            ++ch;
        }
        return *this;
    }
};

InParser f("fibosir.in");
OutParser g("fibosir.out");
int N, M, K, la, lb, lc;
char s[420001], a[500], b[500], c[500];

void add(char *a, char *b, char *c)
{
    int i = 0 , j = 0;
    int x, k, t;

    x = k = t = 0;
    while (i < la && j < lb)
    {
        x = (a[i] - 48) + (b[j] - 48) + t;
        c[k] = (x % 10) + 48;
        t = x/10;
        ++i; ++j; ++k;
    }
    while (i < la)
    {
        x = (a[i] - 48) + t;
        c[k] = (x % 10) + 48;
        t = x/10;
        ++i; ++k;
    }
    while (j < lb)
    {
        x = (b[j] - 48) + t;
        c[k] = (x % 10) + 48;
        t = x/10;
        ++j; ++k;
    }
    if (t)
    {
        c[k] = t + 48;
        ++k;
    }
    c[k] = '\0';
    lc = k;
}
int main()
{
    char max;
    int i, j, poz;

    f >> N >> M >> K;

    //construim fibosir(n)
    a[0] = b[0] = s[0] = s[1] = '1';
    a[1] = b[1] = s[2] = '\0';
    la = lb = lc = 1;
    for (i=2; i<N; ++i)
    {
        add(a, b, c);
        memcpy(a, b, lb);
        memcpy(b, c, lc);
        reverse(c, c + lc);
        la = lb; lb = lc;
        strcat(s, c);
    }
    N = strlen(s);
    i = 0;
    while (i < N)
    {
        for (j=1, max = '0';  j<=M; ++j)
        {
            if (s[i + j*K] > max)
            {
                max = s[i + j*K];
                poz = j;
                if (max == '9') break;
            }
        }
        if (s[i] < max) /// jump
        {
            i += (poz * K);
            M -= poz;
        }
        else
        {
            g << s[i++];
        }
    }
    return 0;
}