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+# LeetCode 279
+    class Solution {
+    public int numSquares(int n) {
+        int[] dp = new int[n + 1];
+        for (int i = 1; i <=n; i++) {
+            dp[i]=Integer.MAX_VALUE;
+            for (int j = 1; j*j<=i ; j++) {
+                dp[i] = Math.min(dp[i],dp[i - j * j] + 1);
+            }
+        }
+        return dp[n];
+    }
+}