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492B - Vanya and Lanterns (Codeforces - Codeforces Round #280 (Div. 2)) categories

Category Problems Count
1 math 679
2 Codeforces Div. 2 - B Problems 457
3 Binary Search & Ternary Search 350
4 sortings 316
5 CUET 56
6 ACM-ICPC Dhaka Site Regional Contests 20