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C# Recursive solution.
public static string kangaroo(int x1, int v1, int x2, int v2) { if((x1>x2 && v1>=v2)) return "NO"; if((x1<x2 && v1<=v2)) return "NO"; if(x1==x2) return "YES"; return kangaroo(x1+v1, v1, x2+v2, v2); }
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Number Line Jumps
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C# Recursive solution.