面试题52 构建乘积数组

题目描述

class Solution {
public:
vector<int> multiply(const vector<int>& A) {

int n=A.size();
vector<int> b(n);
int ret=1;
for(int i=0;i<n;ret*=A[i++]){
b[i]=ret;
}
ret=1;
for(int i=n-1;i>=0;ret*=A[i--]){
b[i]*=ret;
}
return b;
}
};