0_0_38377228_18714.cpp: In function 'int main()': 0_0_38377228_18714.cpp:17:27: error: 'memset' was not declared in this scope memset(n1, 0, sizeof(n1)); //存放每一项前的系数,例如n1[5] = 2就代表x^5系数为2 ^