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154 static double HuffmanCost(const int* const population, int length) {
164     if (population[i] == population[i + 1]) {
168     // population[i] points now to the symbol in the streak of same values.
170       if (population[i] == 0) {
176       if (population[i] == 0) {
191 static double PopulationCost(const int* const population, int length) {
192   return BitsEntropy(population, length) + HuffmanCost(population, length);
195 static double ExtraCost(const int* const population, int length) {
198   for (i = 2; i < length - 2; ++i) cost += (i >> 1) * population[i + 2];