Add Trie, problems, and change structure

algorithms/string/kmp.cpp

algorithms/structure/avl.cpp

algorithms/structure/ball_tree.cpp

algorithms/structure/bit.cpp

algorithms/structure/bit2d.cpp

algorithms/structure/bitmask.cpp

algorithms/structure/disjoint_set.cpp

algorithms/structure/lazy_segment_tree.cpp

algorithms/structure/policy_tree.cpp

algorithms/structure/segment_tree.cpp

algorithms/structure/trie.cpp

misc/template.cpp

problems/crise_hidrica.cpp

problems/escalacao.cpp