/**
  * 
  * @param prices int整型一维数组 
  * @return int整型
  */
function maxProfit( prices ) {
    // write code here
    let minpoint = prices[0];
    let maxpoint = 0;
    for(let i = 0;i<prices.length;i++){
        minpoint = Math.min(minpoint,prices[i]);
        maxpoint = Math.max(maxpoint,prices[i] - minpoint);
    }
    return maxpoint
}
module.exports = {
    maxProfit : maxProfit
};