How option 1 is correct

#1

Given the following code snippet :

string s = “bca”;

do {
cout << s << ’ ';
} while(next_permutation(s.begin(), s.end()));

cout << s;
What is the output of the given code?

bca cab cba abc

bca cab cba cba

bca bca bca bca

bca cab cba bca

#2

All permutations of abc arranged in lexicographical order are
abc acb bac bca cab cba
Since next permutation generates the string next in lexicographical order we can see that cab comes after bca and cba comes after cab. Since cba is largest permutation after that it’ll generate the smallest one i.e abc

#3

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