[AtCoder] A - Reverse and Count|PSAtCoder|Problem Solving-Math-Greedy

A - Reverse and Count

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[AtCoder] B - Triple Pair|PSAtCoder|Problem Solving-Math

B - Triple Pair

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[AtCoder] E - Dice Product 3|PSAtCoder|Problem Solving-Dynamic Programming-Math

E - Dice Product 3

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[Codeforces] Round 798 (Div. 2) D. Lena and Matrix|PSCodeforces|Problem Solving-Binary Search-Geometry

Codeforces Round 798 (Div. 2) D. Lena and Matrix

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[Codeforces] Global Round 21 D. Permutation Graph|PSCodeforces|Problem Solving-Binary Search

Codeforces Global Round 21 D. Permutation Graph

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[Codeforces] Educational Round 130 (Rated for Div. 2) D. Guess The String|PSCodeforces|Problem Solving-Binary Search

Educational Codeforces Round 130 (Rated for Div. 2) D. Guess The String

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[Codeforces] Round 802 (Div. 2) D. River Locks|PSCodeforces|Problem Solving-Math

Codeforces Round 802 (Div. 2) D. River Locks

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[Codeforces] Educational Round 131 (Rated for Div. 2) D. Permutation Restoration|PSCodeforces|Sorting-Problem Solving

Educational Codeforces Round 131 (Rated for Div. 2) D. Permutation Restoration

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[CS Academy] Server Attack|PSCS Academy|Problem Solving-Math

Server Attack

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[CS Academy] Safe Spots|PSCS Academy|Problem Solving-Prefix Sum

Safe Spots

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