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解决Scrapy警告:You do not have a working installation of the service_i...

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解决Scrapy警告:You do not have a working installation of the service_i...

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C++在堆上申请二维数组 - C/C++ - 清泛IT论坛,有思想、有深度

假设要申请是double型大小m*n数组有如下方法方法一:优点:申请空间是连续 缺点:较难理解 double (*d)[n] = new double[m][n]复制代码 方法二:优点:容易理解 缺点:申请空间不能连续且需要多个指针才能管理 double *d[m]; for...