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23/*
从N个元素里面随机一个出来，每个的概率不同
*/
template<class T>
bool RandomOne(const std::vector<T>& v, T& result)
{
if(v.empty()) return false;
int32_t total_weight = 0;
size_t idx = 0;
for(size_t i = 0; i < v.size(); ++i)
{
total_weight += v[i].weight;
double rand = NumberHelper::Random01();
if(rand * total_weight < v[i].weight)
{
idx = i;
}
}
result = v[idx];
return true;
}
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