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from Volume 1. Elementary Problem Solving :: Big Number
输入 X 和 Y,计算 X 和 Y 的乘积。数据范围较大,0 <= X, Y < 10^250。
典型高精度乘法。直接套用高精度的模板来做。貌似也没什么好说的。代码虽长,但都是复制粘贴的渣渣。(连解题报告都是复制粘贴的~)