Permuting Two Arrays

규칙 발견, Constrait 발견

 

Solution Code 

string twoArrays(int k, vector<int> A, vector<int> B) {
    std::sort(A.begin(),A.end());
    std::sort(B.begin(),B.end());
    reverse(B.begin(),B.end());
    for(int i = 0; i < A.size(); i++){
        if(A[i] + B[i] < k) return "NO";
    }  
    return "YES";
}