Antigravity Agent
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10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
137 lines
4.1 KiB
Markdown
137 lines
4.1 KiB
Markdown
---
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id: wiki-2026-0508-problem-solving-skills
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title: Problem Solving Skills
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [Problem Solving, 문제 해결 능력, debugging skills]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [meta, debugging, engineering, methodology]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: meta
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framework: methodology
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---
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# Problem Solving Skills
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## 매 한 줄
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> **"매 problem 정의가 매 solution의 매 절반"**. Problem solving은 매 ill-defined situation을 매 well-defined sub-problems으로 매 decompose하고 매 hypothesis-test loop으로 매 narrow down하는 매 transferable skill set. Polya (1945) 4-step부터 매 modern debugging 까지 매 동일한 backbone.
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## 매 핵심
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### 매 Polya 4-step (1945)
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1. **Understand**: 매 input/output/constraint 매 명시.
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2. **Plan**: 매 known similar problem과 매 mapping.
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3. **Execute**: 매 plan 매 step-by-step.
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4. **Review**: 매 result verify, 매 generalize.
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### 매 Debugging 전용 loop
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- **매 Reproduce**: 매 minimal repro case.
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- **매 Bisect**: 매 git bisect / binary search.
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- **매 Hypothesize**: 매 1개 변수만 매 변경.
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- **매 Verify**: 매 test 매 추가.
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- **매 Postmortem**: 매 root cause + prevention.
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### 매 응용
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1. Production incident response (5-why).
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2. Algorithm design (decomposition + invariants).
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3. LLM prompt debugging (delta isolation).
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## 💻 패턴
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### Minimal repro extraction
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```python
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# Bisect a failing input down to minimal case
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def minimal_repro(input_list, fails):
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while True:
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for i in range(len(input_list)):
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candidate = input_list[:i] + input_list[i+1:]
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if fails(candidate):
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input_list = candidate
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break
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else:
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return input_list
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```
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### Git bisect automation
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```bash
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git bisect start HEAD v1.0.0
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git bisect run pytest tests/test_regression.py::test_bug
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# 매 Bisect 자동 종료 → first-bad-commit 매 출력
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```
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### 5-why root cause
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```yaml
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# postmortem.yaml
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incident: api 500 spike
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why_1: db connections exhausted
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why_2: connection leak in /search handler
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why_3: exception bypassed `with` cleanup
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why_4: custom context manager swallowed asyncio.CancelledError
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why_5: copy-pasted snippet from Stack Overflow without review
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fix: replace with asynccontextmanager + add lint rule
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```
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### Hypothesis-driven test
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```python
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# Change ONE variable per iteration
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import time
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def measure(config):
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t = time.time(); run(config); return time.time() - t
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base = {"batch": 32, "workers": 4, "cache": True}
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for k in base:
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cfg = {**base, k: not base[k] if isinstance(base[k], bool) else base[k]*2}
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print(k, measure(cfg))
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```
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### Rubber-duck logger
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```python
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def trace_state(label, **vars):
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print(f"[{label}]", " | ".join(f"{k}={v!r}" for k, v in vars.items()))
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trace_state("before-loop", i=0, total=len(data), seen=set())
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Bug 매 reproducible | Bisect + minimal repro |
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| Bug 매 intermittent | Logging + statistical test |
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| Algorithm 매 unknown | Polya + analogy from known |
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| Production incident | 5-why + postmortem |
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**기본값**: Reproduce → Bisect → Hypothesize → Verify → Document.
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## 🔗 Graph
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- 부모: [[Debugging]]
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- 변형: [[Polya-Method]] · [[Bisect]]
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- 응용: [[Postmortem]]
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- Adjacent: [[Scientific-Method]]
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## 🤖 LLM 활용
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**언제**: 매 ill-defined task decomposition, 매 stuck-state escape, 매 LLM prompt 디버깅.
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**언제 X**: 매 trivial 1-line typo (overhead).
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## ❌ 안티패턴
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- **매 Shotgun debugging**: 매 random 변경 후 매 동작하면 commit.
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- **매 Symptom-only fix**: 매 root cause 무시.
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- **매 No repro**: 매 "내 환경에선 됨".
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- **매 Heisenbug 회피**: 매 logging 추가하면 매 사라지는 bug 매 무시.
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## 🧪 검증 / 중복
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- Verified (Polya "How to Solve It" 1945, Zeller "Why Programs Fail" 2nd ed.).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — Polya + debugging loop + repro/bisect patterns |
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