1952J - Help what does it mean to be "Based" - CodeForces Solution

2-sat binary search bitmasks brute force chinese remainder theorem combinatorics constructive algorithms data structures dfs and similar divide and conquer dp dsu expression parsing fft flows games geometry graph matchings graphs greedy hashing implementation interactive math matrices meet-in-the-middle number theory probabilities schedules shortest paths sortings string suffix structures strings ternary search trees two pointers