Merge branch 'master' into 'refactor'

algorithms/math/linear_recurrence.cpp

algorithms/math/matrix.cpp

algorithms/structure/sqrt_decomposition.cpp

contests/Cadernaveis/URI1033.cpp

contests/CodeJam/2018/Qualification/A.cpp

contests/CodeJam/2018/Qualification/B.cpp

contests/CodeJam/2018/Qualification/C.cpp

contests/ICPC_LA17/E.cpp

contests/ICPC_LA17/I.cpp