我编写leetcode的第89题gray code, 发现我自己电脑编译出的结果和网页的编译结果不同,甚是蛋疼!
原码如下:
class Solution {
public:
vector grayCode(int n) {
if (n ==0 ){
vector outcomes;
outcomes.push_back(0);
return outcomes;
}
else if (n == 1) {
vector outcome;
outcome.push_back(0);
outcome.push_back(1);
return outcome;
}
else {
vector<int> records = grayCode(n-1);
vector<int>::reverse_iterator first_1 = records.rbegin();
vector<int>::reverse_iterator last_1 = records.rend();
for(vector<int>::reverse_iterator iter=first_1;iter != last_1;iter++){
records.push_back(*iter+pow(2,n-1));
}
return records;
}
}
};
提交后的提示如下:
wrong answer:
input 3
output [0,1,3,2,6,7,4,25551540]
expected [0,1,3,2,6,7,5,4]
但是我用xcode和Mac自带的编译器运行,得到的结果都是 expected 啊,是不是我的代码出现了一些危险行为??
跪求大神!!