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Z algorithm problems
Problem Name Online Judge Contest Difficulty Level
1 Password Categories Codeforces Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) 2
2 Query Problem Categories SPOJ 2
3 Ancient Prophesy Categories Codeforces Codeforces Round #158 (Div. 2) 4