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650B - Image Preview (Codeforces - Codeforces Round #345 (Div. 1) & Codeforces Round #345 (Div. 2)) categories

Category Problems Count
1 Dynamic Programming 1222
2 Codeforces Div. 2 - D Problems 443
3 Binary Search & Ternary Search 352
4 two pointers 128