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2_16253_1140392_7887.cpp
2_16253_1140392_7887.cpp(18) : error C2668: “sqrt” : 对重载函数的调用不明确
        \include\math.h(626): 可能是“long double sqrt(long double)”
        \include\math.h(578): 或       “float sqrt(float)”
        \include\math.h(200): 或       “double sqrt(double)”
        试图匹配参数列表“(int)”时