Cod sursa(job #2721664)

Utilizator Marius7122FMI Ciltea Marian Marius7122 Data 12 martie 2021 04:35:38
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.2 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
 
using namespace std;
 
ifstream fin("algsort.in");
ofstream fout("algsort.out");
 
const int INF = (1ll << 31) - 1;
 
void radixSort(vector<int> &arr, int mx = INF, int basePow = 8)
{
    int base = 1 << 8;
    int mask = base - 1;
    vector<int> newarr(arr.size()), cnt(base), start(base);
    long long fact = 1;
    int sh = 0;
    while(mx / fact > 0)
    {
        // compute start position
        cnt.assign(base, 0);
        for(int x : arr)
            cnt[(x >> sh) & mask]++;
        start[0] = 0;
        for(int i = 1; i < base; i++)
            start[i] = start[i-1] + cnt[i-1];
 
        for(int x : arr)
        {
            int coef = (x >> sh) & mask;
            newarr[start[coef]++] = x;
        }
 
        arr = newarr;
 
        fact *= base;
        sh += basePow;
    }
}
 
int main()
{
    int n;
    fin >> n;
 
    vector<int> v(n);
    int mx = 0;
    for(int i = 0; i < n; i++)
    {
        fin >> v[i];
        if(v[i] > mx)
            mx = v[i];
    }
 
    radixSort(v, mx);
 
    for(int i = 0; i < n; i++)
        fout << v[i] << ' ';
    return 0;
}