[leetcode] #279 Perfect Squares (medium)
題意:
給一個非整數,算出其最少可以由幾個完全平方陣列成(1,4,9,16……)
思路:
可以得到一個狀態轉移方程
dp[i] = min(dp[i], dp[i - j * j] + 1); 程式碼如下: Runtime: 60 ms, faster than 69.83% 有點慢class Solution { public: int numSquares(int n) { int dp[n + 1]; for (int i = 0; i <= n; i++) { dp[i]= i; for (int j = 1; j * j <= i; j++) { dp[i] = min(dp[i], dp[i - j * j] + 1); } } return dp[n]; } };
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