int *output = (int*)malloc(n * sizeof(int));
第三十九条 国家建立符合受控热核聚变特点、促进核聚变应用的监督管理制度，对聚变燃料、聚变装置（设施）实行分级分类管理。
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Hand optimization can still be beneficial, especially if you have a
output[count[idx] - 1] = arr[i]; // 放到正确位置
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