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int bestTimeToBuyAndSellStock(vector<int>&prices) { // Write your code here. int n=prices.size(); int b; int min_price=INT_MAX; int max_price=INT_MIN;
for(int i=0;i<n-1;i++){ if(prices[i]<=min_price)min_price=prices[i]; }
for(int i=0;i<n;i++){ if(prices[i]==min_price)b=i; }
for(int j=b;j<n;j++){ if(prices[j]>max_price)max_price=prices[j]; }
return max_price-min_price; }