diff --git a/clone-graph/README.md b/clone-graph/README.md
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+- 문제: https://leetcode.com/problems/clone-graph/
+- 풀이: https://www.algodale.com/problems/clone-graph/
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diff --git a/course-schedule/README.md b/course-schedule/README.md
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+- 문제: https://leetcode.com/problems/course-schedule/
+- 풀이: https://www.algodale.com/problems/course-schedule/
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diff --git a/design-add-and-search-words-data-structure/README.md b/design-add-and-search-words-data-structure/README.md
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+++ b/design-add-and-search-words-data-structure/README.md
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+- 문제: https://leetcode.com/problems/design-add-and-search-words-data-structure/
+- 풀이: https://www.algodale.com/problems/design-add-and-search-words-data-structure/
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diff --git a/number-of-islands/README.md b/number-of-islands/README.md
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+++ b/number-of-islands/README.md
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+- 문제: https://leetcode.com/problems/number-of-islands/
+- 풀이: https://www.algodale.com/problems/number-of-islands/
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diff --git a/pacific-atlantic-water-flow/README.md b/pacific-atlantic-water-flow/README.md
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index 000000000..6603f2f54
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+++ b/pacific-atlantic-water-flow/README.md
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+- 문제: https://leetcode.com/problems/pacific-atlantic-water-flow/
+- 풀이: https://www.algodale.com/problems/pacific-atlantic-water-flow/
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