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040000 tree 19b7cd054e9f0a491a71267fa4e65b4e15672d52	25_algorithms
040000 tree 31d8b2eca81f02d66ceb044ce1b468ccf478420f	26_numerics
040000 tree af06cee8d3d7db76e5e9b26bea29aec3ef8ae056	27_io
040000 tree 6f2e4f2e5c4d34b3c11541b8f9b0764d0b5b43d7	ext