smoky

Add solution and test-cases for problem 371

Add solution and test-cases for problem 672

Add solution and test-cases for problem 637

Add solution and test-cases for problem 2709

Add solution and test-cases for problem 2092

Add solution and test-cases for problem 786

Add solution and test-cases for problem 274

Add solution and test-cases for problem 636

Add solution and test-cases for problem 1462

Add solution and test-cases for problem 2402