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第一题线段树,贡献6个WA...在此特别感谢黄鸟人...
if(r<=mid) insertseg(2*v,l,r,c);
else
if(mid<l) insertseg(2*v+1,l,r,c);
else
{
insertseg(2*v,l,mid,c);
insertseg(2*v+1,mid+1,r,c);
}
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