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Explore Stack Internal #CJam, 110 103 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),5>\f<{:X)\0==X1b_X,.85*<!\.15X,*>!X0=!*\X0=*+&},:,W>U):U+}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
#CJam, 110 103 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),5>\f<{:X)\0==X1b_X,.85*<!\.15X,*>!X0=!*\X0=*+&},:,W>U):U+}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),5>\f<{:X)\0==X1b_X,.85*<!\.15X,*>!X0=!*\X0=*+&},:,W>U):U+}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
#CJam, 110110 103 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),\f<{,4>},{)\0==},5>\f<{:X1b_XX)\0==X1b_X,.85*<!\.15X,*>!X0=!*\X0=*e|*\X0=*+&},:,UW>U):U+-2>}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
#CJam, 110 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),\f<{,4>},{)\0==},{:X1b_X,.85*<!\.15X,*>!X0=!*\X0=*e|},:,U):U+-2>}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
#CJam, 110 103 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),5>\f<{:X)\0==X1b_X,.85*<!\.15X,*>!X0=!*\X0=*+&},:,W>U):U+}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.
#CJam, 110 bytes
Pretttttty long. Can be golfed a lot.
q~_,,\f>{_,),\f<{,4>},{)\0==},{:X1b_X,.85*<!\.15X,*>!X0=!*\X0=*e|},:,U):U+-2>}%{,(},_{{_W=IW=>\1bI1b>!&!},}fI, Input is like
[0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 0 0 0] Output is the number of phases.