[leetcode] #279 Perfect Squares (medium)

阿新 • • 發佈：2018-11-06

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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