[ackku] week 2 #713
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[ackku] week 2 #713
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TonyKim9401
reviewed
Dec 20, 2024
Comment on lines
+5
to
+24
| public int climbStairs(int n) { | ||
| return dfs(n, new HashMap<>()); | ||
| } | ||
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| private int dfs(int n, Map<Integer, Integer> memo) { | ||
| if (n == 0) { | ||
| return 1; | ||
| } | ||
| if (n < 0) { | ||
| return 0; | ||
| } | ||
| if (memo.containsKey(n)) { | ||
| return memo.get(n); | ||
| } | ||
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| int result = dfs(n - 1, memo) + dfs(n - 2, memo); | ||
| memo.put(n, result); | ||
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| return result; | ||
| } |
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DP만 생각했는데 DFS 풀이가 참신한것 같습니다 :)
TonyKim9401
reviewed
Dec 20, 2024
Comment on lines
+24
to
+25
| arr[s.charAt(i) - 97]++; | ||
| arr[t.charAt(i) - 97]--; |
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97 대신 'a' 를 쓰시면 좀 더 직관적으로 다가올것 같아요!
TonyKim9401
approved these changes
Dec 20, 2024
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