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#include<bits/stdc++.h>
using namespace std;
int bestTimeToBuyAndSellStock(vector<int>&prices) {
    // Write your code here.
    int mini = prices[0];
    int maxProfit = 0;
    int n = prices.size();

    for(int i = 1; i<n; i++){
        int cost = prices[i] - mini;
        maxProfit = max(maxProfit, cost);
        mini = min(mini, prices[i]);
    }
    return maxProfit;
}