代码

double plus(double a, double b)
{
long double ret = 0;
for (int j = 0; j < 5; ++j) {
for (int i = 0; i <= 35; ++i) ret += a, ret -= b;
for (int i = 0; i <= 35; ++i) ret += b, ret -= a;
}
ret += a + b;
return ret;
}

评测结果