new file:   12746_COLORFUL_CIRCLE/color.py
	new file:   12746_COLORFUL_CIRCLE/prb.txt
	new file:   12746_COLORFUL_CIRCLE/tdata
	new file:   20172_div_3/div.c
	new file:   20172_div_3/div_w.c
	new file:   20172_div_3/gen.py
	new file:   20172_div_3/prb.txt
	new file:   20172_div_3/rdata
	renamed:    todo/tips -> misc/docs/tips
	new file:   misc/maths/inv_mod.c
	modified:   misc/maths/power_mod.c
	deleted:    todo/seq/gen_seq.c