计算多项式给定点x处的值
\(f(x)=a_{0}+a_{1}x+...+a_{n-1}x^{n-1}+a_{n}x^{n}\)
const func = (n, a = [], x) => {
let sum = a[0];
for (let i = 1; i < n; i++) {
sum += a[i] * x ** i;
}
return sum;
};
\(f(x)=a_{0}+x(a_{1}+x(...(a_{n-1}+x(a_{x}))...))\)
const func = (n,a=[],x)=>{
let sum = a[n]
for (let i = n;i>0;i--){
sum = a[i-1]+ x*sum
}
return sum
}