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PYmain.py

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# Problem: Two Sum
# Given an array of integers 'nums' and an integer 'target', return indices of the two numbers such that they add up to target.
# Complexity: Time O(N), Space O(N)

def two_sum(nums: list[int], target: int) -> list[int]:
    seen = {}
    for i, num in enumerate(nums):
        complement = target - num
        if complement in seen:
            return [seen[complement], i]
        seen[num] = i
    return []

# --- Automated Test Suite ---
test_cases = [
    {"nums": [2, 7, 11, 15], "target": 9, "expected": [0, 1]},
    {"nums": [3, 2, 4], "target": 6, "expected": [1, 2]},
    {"nums": [3, 3], "target": 6, "expected": [0, 1]},
    {"nums": [1, 5, 8, 12, 19], "target": 20, "expected": [0, 4]}
]

print("Running Two Sum Test Cases...")
all_passed = True
for idx, tc in enumerate(test_cases, 1):
    result = two_sum(tc["nums"], tc["target"])
    passed = result == tc["expected"]
    if not passed:
        all_passed = False
    status = "✅ PASS" if passed else "❌ FAIL"
    print(f"Test {idx}: {status} | Input: {tc['nums']}, Target: {tc['target']} | Output: {result} (Expected: {tc['expected']})")

print("-" * 50)
if all_passed:
    print("🎉 ALL TEST CASES PASSED! Optimal O(N) solution.")
else:
    print("⚠️ Some test cases failed. Review logic above.")

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Two Sum Hash Map O(N)

def two_sum(nums, target):
    seen = {}
    for i, num in enumerate(nums):
        diff = target - num
        if diff in seen:
            return [seen[diff], i]
        seen[num] = i
    return []

print("Indices:", two_sum([2, 7, 11, 15], 9))

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Online DSA & Algorithm Interview Solver

Practice competitive programming and technical interview problems with instant test suite feedback, edge case validation, and clean starter templates.

⚡

Instant Zero-Setup Execution

Run code immediately in your browser with zero downloads, installation, or environment setup.

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Interactive Standard Input (stdin)

Full support for interactive scanners, terminal arguments, and multi-line user inputs.

🤖

AI Error Diagnosis & 1-Click Fixes

Get instant What • Why • How error explanations and auto-apply fixes directly into your editor.

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def two_sum(nums, target): seen = {} for i, num in enumerate(nums): diff = target - num if diff in seen: return [seen[diff], i] seen[num] = i return [] print("Indices:", two_sum([2, 7, 11, 15], 9))

⚡ Online Algorithms & DSA Compiler

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⚡ Online Algorithms & DSA Compiler

Online DSA & Algorithm Interview Solver

Ready to Master Algorithms & DSA? Learn with Structured Lessons

Data Structures & Algorithms Masterclass

📖Algorithms & DSA Quick Syntax Reference

❓Frequently Asked Questions about Online Algorithms & DSA Compiler