smoky

Add solution and test-cases for problem 816

Add solution and test-cases for problem 762

Add solution and test-cases for problem 1750

Add solution and test-cases for problem 948

Add solution and test-cases for problem 693

Add solution and test-cases for problem 638

Add solution and test-cases for problem 419

Add solution and test-cases for problem 190

Add solution and test-cases for problem 2424

Add solution and test-cases for problem 2864