Wild Widow questions

• finding the index of last occurrence of an element in an array using binary search PHP
• Longest Substring Without Repeating Characters corner cases
• how to continue with $q.all() when some promises fail
• Sort an integer array, negative integers in the front and positive integers in the back
• narrowing conversion from int to long unsigned int {} is ill-formed in C++11
• count the occurrences of all the letters in a string PHP
• Find the only unique element in an array of a million elements
• How to create an associative array in JavaScript literal notation

Wild Widow answers