[AtCoder] D - Ki|PSAtCoder|Problem Solving-DFS-Prefix Sum

D - Ki

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[AtCoder] B - Kleene Inversion|PSAtCoder|Fenwick Tree-Problem Solving

B - Kleene Inversion

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[AtCoder] D - Face Produces Unhappiness|PSAtCoder|Problem Solving-Greedy-Monotonic Stack

D - Face Produces Unhappiness

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[AtCoder] E - Strings of Impurity|PSAtCoder|Problem Solving-Binary Search

E - Strings of Impurity

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[AtCoder] E - League|PSAtCoder|Problem Solving-Topological Sort

E - League

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[Codeforces] Round #208 (Div. 2) B. Dima and Text Messages|PSCodeforces|Problem Solving-Two Pointer-Greedy

Codeforces Round #208 (Div. 2) B. Dima and Text Messages

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[Codeforces] Round #212 (Div. 2) A. Two Semiknights Meet|PSCodeforces|Problem Solving-Math-BFS

Codeforces Round #212 (Div. 2) A. Two Semiknights Meet

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[Codeforces] Round #215 (Div. 1) A. Sereja and Algorithm|PSCodeforces|Problem Solving-Prefix Sum

Codeforces Round #215 (Div. 1) A. Sereja and Algorithm

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[Codeforces] Round #220 (Div. 2) B. Inna and Nine|PSCodeforces|Problem Solving-Greedy

Codeforces Round #220 (Div. 2) B. Inna and Nine

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[Codeforces] Round #225 (Div. 2) B. Multitasking|PSCodeforces|Sorting-Problem Solving-Greedy

Codeforces Round #225 (Div. 2) B. Multitasking

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