Argsort c++

#include <iostream>
#include <vector>
#include <numeric>      // std::iota
#include <algorithm>    // std::sort, std::stable_sort

using namespace std;

template <typename T>
vector<size_t> sort_indexes(const vector<T> &v) {

  // initialize original index locations
  vector<size_t> idx(v.size());
  iota(idx.begin(), idx.end(), 0);

  // sort indexes based on comparing values in v
  // using std::stable_sort instead of std::sort
  // to avoid unnecessary index re-orderings
  // when v contains elements of equal values 
  stable_sort(idx.begin(), idx.end(),
       [&v](size_t i1, size_t i2) {return v[i1] < v[i2];});

  return idx;
}

//Usage:
for (auto i: sort_indexes(v)) {
  cout << v[i] << endl;
}

Source: stackoverflow.com

Similar codes

0 vote175 views1 answer
Cyclic array rotation in cpp
C++
7 votes175 views6 answers
C++ sleep function
C++
0 vote157 views1 answer
C++, for-loop over an array array
C++
0 vote192 views1 answer
Texorpdfstring math in title latex
C++
3 votes179 views1 answer
Sfml draw line
C++
3 votes172 views3 answers
C++ get char of string
C++
0 vote206 views1 answer
Std distance
C++
0 vote176 views1 answer
How to cehck if list has element c++
C++
4 votes166 views2 answers
Gcd recursion c++
C++
8 votes142 views1 answer
How to print every element of the array in cpp
C++