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C1.cpp
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C1.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios::sync_with_stdio(0);cin.tie(0)
long long ara[200005];
int main()
{
fastio;
long long t,n,i,mn,mx;
cin>>t;
while(t--)
{
cin>>n;
for(i=0;i<n;i++)
cin>>ara[i];
if(ara[0]>=0)
{
mn=ara[0];
mx=ara[0];
}
else
{
mn=ara[0];
mx=(-1)*ara[0];
}
for(i=1;i<n;i++)
{
long long mncur,mxcur;
mncur=min(mn+ara[i],min(abs(mn+ara[i]),min(mx+ara[i],abs(mx+ara[i]))));
mxcur=max(mn+ara[i],max(abs(mn+ara[i]),max(mx+ara[i],abs(mx+ara[i]))));
mn=mncur;
mx=mxcur;
}
cout<<mx<<"\n";
}
return 0;
}