add solution of coin-change

Author: jinhyungrhee

coin-change/jinhyungrhee.java

@@ -0,0 +1,22 @@
+import java.util.*;
+class Solution {
+    int INF = 987654321;
+    public int coinChange(int[] coins, int amount) {
+        if (amount == 0) return 0;
+
+        int[] dp = new int[amount + 1];
+        Arrays.fill(dp, INF);
+
+        dp[0] = 0;
+        for (int coin : coins) {
+            if (coin <= amount) dp[coin] = 1;
+        }
+
+        for (int i = 1; i <= amount; i++) {
+            for (int coin : coins) {
+                if ((i - coin) >= 0) dp[i] = Math.min(dp[i], dp[i - coin] + 1);
+            }
+        }
+        return (dp[amount] == INF) ? -1 : dp[amount];
+    }
+}