Vistaprint is one of our best photo printing services for turning family memories into keepsake photobooks, plus you can use it to order novelty Christmas gifts, stock up on office supplies, including ...
//Strings are usually ordered in lexicographical order. That means they are ordered by comparing their leftmost different characters. For example, abc < abd because c < d. Also z > yyy because z > y.
#define rep(i, a, b) for (ll i = a; i < b; i++) #define rev(i, a, b) for (ll i = a; i >= b; i--) ...
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