Section Recap

Look at what you can do now:

$1.$ Identify overlapping subproblems (the exponential waste hiding in recursion)

$2.$ Add memoization to fix it (three lines, massive speedup)

$3.$ Convert to tabulation when you want cleaner code

$4.$ Reduce space by tracking only the states you need

$5.$ Handle edge cases in problems like Decode Ways

You have a framework: define state, write transition, handle base cases, extract answer. That's how every DP problem starts. For more practice, solve the problems in the training section. Next, you'll explore more patterns with 1D (one-dimensional) DP problems.