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Perfect Squares

Medium

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Given a positive integer n, find the least number of perfect square numbers that sum to n.

Sample Input:

Sample Output:

Hints

Hint 1

Use dynamic programming

Hint 2

DP[i] = min(DP[i - j*j]) + 1 for all j where j*j ≤ i

Hint 3

Or use mathematical theorem (Lagrange's Four Square theorem)

Code Editor

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