smoky

Add solution and test-cases for problem 1813

Add solution for problem 2491

Add solution and test-cases for problem 1590

Add solution and test-cases for problem 1331

Add solution and test-cases for problem 1497

Add solution and test-cases for problem 1041

Add solution and test-cases for problem 939

Add solution and test-cases for problem 949

Add solution and test-cases for problem 849

Add solution and test-cases for problem 2416