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Hello, As a part of my program, I have to convert a column of strings in a vector(containing strings of both upper and lower case) to uppercase. The column is accessed as array.at(i).at(2) I have tried to convert character by character using toupper() , but I didnt work for me. … 
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I am having problem with sorting and need help with it. I have to sort the integers in an array and finally after sorting the index number of all the elements before sorting are to be preserved. I have used merge sort. The sorting is done but the index numbers …
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