[FE] cuong lam#262
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Problem 1 : Three ways to sum to N
Summary : Added three unique implementations (iterative, formula, functional recursion) to solve sum-to-n problem, with test cases and complexity analysis included.
Problem 2 : Fancy Form
Summary : Implemented a currency swap form with bidirectional amount calculation (editing either field recalculates the other), live exchange rate display, input validation (empty, non-numeric, negative, overflow), dynamic currency selectors, a swap-direction button that preserves amounts, a simulated async transaction with loading state, and a success modal with visual feedback.
Problem 3 : Messy React
Summary : fixed filter & type bugs, memoized calculations, stable keys, tie-breaker, empty state handling, and improved render performance.