买卖股票最好时机
买卖股票的最好时机
http://www.nowcoder.com/questionTerminal/64b4262d4e6d4f6181cd45446a5821ec
记录一下最小值，O(N)扫一遍
class Solution {
public:
/**
*
* @param prices int整型vector
* @return int整型
*/
int maxProfit(vector<int>& prices) {
int minn = 0x3f3f3f3f,ans = 0;
for(auto i:prices)
{
ans = max(ans,i - minn);
minn = min(i,minn);
}
return ans;
}
}; 
