findminval.m

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%%%%%%%%%%%%%%%%%%%%%%%%%%% find l and r   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function [l,r]=findminval(tree)


s=find(tree(5,:)==1);
if size(s,2)<2
    error('Error input!');
end
firval=realmax;secval=realmax;
for i=s;    
    if firval>tree(2,i)
        if secval>firval
            second=first;secval=firval;
        end
        first=i;firval=tree(2,i);
    elseif secval>tree(2,i)
        second=i;secval=tree(2,i);
    end
end
l=min([first,second]);r=max([first,second]);