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copied!<p><strong>Edit</strong></p> <p>Better than before approach without using helper vectors: (<a href="http://www.ideone.com/wRHYv" rel="nofollow">source on ideone</a>):</p> <pre><code>#include <vector> #include <algorithm> #include <iostream> template<class Vals> void sortingPermutation(const Vals& values, std::vector<int>& v){ int size = values.size(); v.clear(); v.reserve(size); for(int i=0; i < size; ++i) v.push_back(i); std::sort(v.begin(), v.end(), [&values](int a, int b) -> bool { return values[a] < values[b]; }); } int main() { std::vector<double> values; values.push_back(24); values.push_back(55); values.push_back(22); values.push_back(1); std::vector<int> permutation; sortingPermutation(values, permutation); typedef std::vector<int>::const_iterator I; for (I p = permutation.begin(); p != permutation.end(); ++p) std::cout << *p << " "; std::cout << "\n"; } </code></pre> <p>I am using lambda from C++0x, but it can be replaced with simple functor object:</p> <pre><code>template<class T> struct CmpPairs{ CmpPairs(const std::vector<T> &v): v_(v) {} std::vector<T> v_; bool operator()(int a, int b){ return v_[a] < v_[b]; } }; template<class T> CmpPairs<T> CreateCmpPairs(const std::vector<T> & v) { return CmpPairs<T>(v); } //in sortingPermutation: std::sort(v.begin(), v.end(), CreateCmpPairs(values)); </code></pre> <p>Source of old solution with <code>std::map</code>: <a href="http://www.ideone.com/k1Fxj" rel="nofollow">ideone</a></p>

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