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Author: assassint2017

Coin Change/Coin_Change.cpp

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+// 典型的动态规划
+// Runtime: 36 ms, faster than 88.91% of C++ online submissions for Coin Change.
+// Memory Usage: 12.6 MB, less than 86.27% of C++ online submissions for Coin Change.
+class Solution 
+{
+public:
+    int coinChange(vector<int>& coins, int amount) 
+    {
+        vector<int> memo(amount + 1, 0);
+        for (int i = 1; i <= amount; ++i)
+        {
+            int minValue = INT_MAX;
+            bool found = false;
+            for (int coin : coins)
+            {
+                if (i - coin < 0 || memo[i - coin] == -1)
+                    continue;
+                else
+                {
+                    minValue = min(minValue, memo[i - coin] + 1);    
+                    found = true;    
+                }        
+            }
+            memo[i] = found ? minValue : -1;
+        }
+        return memo[amount];
+    }
+};