Arrange given numbers to form the biggest number | GeeksforGeeks


Arrange given numbers to form the biggest number

Given an array of numbers, arrange them in a way that yields the largest value. For example, if the given numbers are {54, 546, 548, 60}, the arrangement 6054854654 gives the largest value. And if the given numbers are {1, 34, 3, 98, 9, 76, 45, 4}, then the arrangement 998764543431 gives the largest value.
// A comparison function which is used by sort() in printLargest()
int myCompare(string X, string Y)
{
    // first append Y at the end of X
    string XY = X.append(Y);
    // then append X at the end of Y
    string YX = Y.append(X);
    // Now see which of the two formed numbers is greater
    return XY.compare(YX) > 0 ? 1: 0;
}
// The main function that prints the arrangement with the largest value.
// The function accepts a vector of strings
void printLargest(vector<string> arr)
{
    // Sort the numbers using library sort funtion. The function uses
    // our comparison function myCompare() to compare two strings.
    sort(arr.begin(), arr.end(), myCompare);
    for (int i=0; i < arr.size() ; i++ )
        cout << arr[i];
}
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