klips/cpp/algorithms/sorting/radix/lib-radix.cpp

30 lines
1.0 KiB
C++

#include "lib-radix.hpp"
#include "lib-counting.hpp"
#include <algorithm>
#include <vector>
void RadixSort(std::vector<int> &array)
{
int maxValue = *std::max_element(array.begin(), array.end());
// Get the total number of digits in the maximum value within the set
// + 100 has 3 digits; 10 has 2 digits; etc..
int digits = 0;
for (int tempMax = maxValue; tempMax > 0; tempMax /= 10) digits++;
// For each placeValue of the maximum value within the set
for (int placeValue = 1; maxValue / placeValue > 0; placeValue *= 10) {
// Perform counting sort on all values, only considering the placeValue digit
// Result of sorting the first placeValue:
// + 12, 10, 15, 5, 3, 101, 109, 115 -> 10, 101, 12, 3, 115, 15, 5, 109
// Result of sorting the second placeValue:
// + 10, 101, 12, 3, 115, 15, 5, 109 -> 3, 5, 101, 109, 10, 12, 115, 15
// Result of sorting the third placeValue:
// + 3, 5, 101, 109, 10, 12, 115, 15 -> 3, 5, 10, 12, 15, 101, 109, 115
CountingSort(array, placeValue);
}
}