Cod sursa(job #1749732)

Utilizator StarGold2Emanuel Nrx StarGold2 Data 28 august 2016 17:21:58
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 3.1 kb
#include <bits/stdc++.h>
using namespace std;

const int DIM = 5e5 + 5;
const int PER = (1 << 8) - 1;

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;
    }
} in( "algsort.in" );

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

    void write_ch(char ch) {
        if (sp == 50000) {
            fwrite(buff, 1, 50000, fout);
            sp = 0;
            buff[sp++] = ch;
        } else {
            buff[sp++] = ch;
        }
    }


public:
    OutParser(const char* name) {
        fout = fopen(name, "w");
        buff = new char[50000]();
        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;
    }
} out( "algsort.out" );

int V[DIM], P[PER + 1], W[DIM], n;

void radixSort ()
{
    for (int p = 0; p <= 24; p += 8)
    {
        for (int i = 0; i <= PER; i ++)
            P[i] = 0;

        for (int i = 1; i <= n; i ++)
            P[((V[i]>>p)&PER)] ++;

        for (int i = 1; i <= PER; i ++)
            P[i] += P[i-1];

        for (int i = n; i >= 1; i --)
            W[P[((V[i]>>p)&PER)]--] = V[i];

        for (int i = 1; i <= n; i ++)
            V[i] = W[i];
    }

    return;
}

int main( int argc, const char *argV[] ) {

    in >> n;
    for( int i = 1; i <= n; i ++ )
        in >> V[i];

    radixSort();

    for( int i = 1; i <= n; i ++ )
        out << V[i] << " ";

    return 0;
}