feat: calc step
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@ -328,7 +328,8 @@ find_row_mask(std::vector<set_t> &sets,
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std::vector<std::thread> workers;
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auto thread_num = std::thread::hardware_concurrency();
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if (thread_num > 2) { thread_num -= 2; }
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const uint64_t step = (last_mask - row_mask) / thread_num;
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uint64_t step = 0;
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for (uint64_t i = row_mask; i < last_mask; ++step) { i = next_bit_permutation(i); }
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for (int i = 0; i < thread_num; ++i) {
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workers.emplace_back([&] {
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