Sanjay Muthu

Changed pg_restore -U user -d postgres data.dump into pg_restore -c --if-exists -U user -d postgres data.dump. The original command would insert duplicate rows causing the tables size to increase.

### Describe your change: * [x] Add an algorithm? * [ ] Fix a bug or typo in an existing algorithm? * [ ] Add or change doctests? -- Note:...

Added graphs/travelling_salesman_problem.py

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### Describe your change: * [x] Add an algorithm? * [ ] Fix a bug or typo in an existing algorithm? * [ ] Add or change doctests? -- Note:...

[WIP] Added faceit.com

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Added a new site - faceit.com (Requested by #1960)

Made a new challenge "Implement a program to find the first non-recurring character in the string" at array_strings/non_recurring_char

Made any() a const member function The original code would not compile in C++ 14+ and would give the error `error: passing ‘const Debug’ as ‘this’ argument discards qualifiers [-fpermissive]`