add: 220521 [cpp]

cpp/2205/220521.cpp

@@ -0,0 +1,25 @@
+#include <vector>
+#include <cstring>
+
+/**
+ * 322. Coin Change
+ * You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money.
+ * Return the fewest number of coins that you need to make up that amount. If that amount of money cannot be made up by any combination of the coins, return -1.
+ * You may assume that you have an infinite number of each kind of coin.
+ */
+
+class Solution {
+public:
+    static int coinChange(const std::vector<int>& coins, int amount) {
+        if (!amount)
+            return 0;
+        int dp[10005];
+        std::memset(dp, 0x7F, sizeof dp);
+        dp[0] = 0;
+        for (int i = 0; i < 10005; ++i)
+            for (int j : coins)
+                if (i - j >= 0 && dp[i - j] < 0x7F7F7F7F)
+                    dp[i] = std::min(dp[i], dp[i - j] + 1);
+        return dp[amount] >= 0x7F7F7F7F ? -1 : dp[amount];
+    }
+};

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220520.cpp)
+ADD_EXECUTABLE(2205 220521.cpp)