solution\all pass.c ........\butt.c ........\dtsp1.doc ........\dtsp10.docx ........\dtsp2.doc ........\dtsp3.docx ........\dtsp4.docx ........\dtsp5.docx ........\dtsp6.docx ........\dtsp7.docx ........\dtsp8.docx ........\dtsp9.docx ........\idft.c ........\ifft.c