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編輯JAVA解答的部分內容

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1. 提供JAVA填充數組的函數Arrays.fill()
2. for loop中不需要if statement，並有用 // 解釋原因
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Lozakaka
2023-06-01 19:44:43 -04:00
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parent 6156804822
commit 32185d5f2d
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problems/0279.完全平方数.md
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@ -177,15 +177,19 @@ class Solution {
for (int j = 0; j <= n; j++) {
dp[j] = max;
}
//如果不想要寫for-loop填充數組的話，也可以用JAVA內建的Arrays.fill()函數。
//Arrays.fill(dp, Integer.MAX_VALUE);
//当和为0时，组合的个数为0
dp[0] = 0;
// 遍历物品
for (int i = 1; i * i <= n; i++) {
// 遍历背包
for (int j = i * i; j <= n; j++) {
if (dp[j - i * i] != max) {
//if (dp[j - i * i] != max) {
dp[j] = Math.min(dp[j], dp[j - i * i] + 1);
}
//}
//不需要這個if statement，因爲在完全平方數這一題不會有"湊不成"的狀況發生（ 一定可以用"1"來組成任何一個n），故comment掉這個if statement。
}
}
return dp[n];