【Codeforces】[598A]Tricky Sum

【Codeforces】[606A]Magic Spheres

【Codeforces】[610A]Pasha and Stick

【Codeforces】[610B]Vika and Squares

【Codeforces】[612C]Replace To Make Regular Bracket Sequence

【Codeforces】[614A]Link/Cut Tree

【Codeforces】[617A]Elephant

【Codeforces】[621A]Wet Shark and Odd and Even

【Codeforces】[621B]Wet Shark and Bishops

【Codeforces】[624A]Save Luke