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chapter_greedy/greedy_algorithm.md

@@ -119,7 +119,24 @@ status: new
 === "C#"
 
     ```csharp title="coin_change_greedy.cs"
-    [class]{coin_change_greedy}-[func]{coinChangeGreedy}
+    /* 零钱兑换：贪心 */
+    int coinChangeGreedy(int[] coins, int amt) {
+        // 假设 coins 列表有序
+        int i = coins.Length - 1;
+        int count = 0;
+        // 循环进行贪心选择，直到无剩余金额
+        while (amt > 0) {
+            // 找到小于且最接近剩余金额的硬币
+            while (coins[i] > amt) {
+                i--;
+            }
+            // 选择 coins[i]
+            amt -= coins[i];
+            count++;
+        }
+        // 若未找到可行方案，则返回 -1
+        return amt == 0 ? count : -1;
+    }
     ```
 
 === "Swift"