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fix pair_map
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@@ -179,7 +179,7 @@ namespace tc {
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template<typename T>
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size_t pair_map<T>::idx(size_t i, size_t j) {
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if (i < j) std::swap(i, j);
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if (i > j) std::swap(i, j);
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return j * (j + 1) / 2 + i;
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}
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