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    Here is my c++ solution, you can have the explanation here : https://youtu.be/bRVVCCmXN0Y

    string kangaroo(int x1, int v1, int x2, int v2) {
        if(v1 > v2 && (x2-x1) % (v1-v2) == 0) return "YES";
        return "NO";
    }