279. Perfect Squares
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DP问题
class Solution {public: int numSquares(int n) { vector<int> dp(n+1,INT_MAX); dp[0]=0; for(int i=1;i<=n;i++) { for(int m=1;m<=(int)(sqrt(i));m++) dp[i]=min(dp[i],1+dp[i-m*m]); } return dp[n]; }};
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