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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 j=1;j*j<=i;j++){
dp[i]=min(dp[i],1+dp[i-j*j]);
}
}
return dp[n];
}
};
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