Create 121.cpp

Best Time to Buy and Sell Stock

Author: ritik307

leetcode/cpp/dynamic programming/121.cpp

@@ -0,0 +1,21 @@
+//Best Time to Buy and Sell Stock
+
+class Solution {
+public:
+    int maxProfit(vector<int>& prices) {
+        if(prices.size()==0){
+            return 0;
+        }
+        int buy=prices[0];
+        int ans=0;
+        for(int i=0;i<prices.size();i++){
+            if(prices[i]<buy){
+                buy=prices[i];
+            }
+            else if(prices[i]-buy>ans){
+                ans=prices[i]-buy;
+            }
+        }
+        return ans;
+    }
+};