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D.cpp
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D.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],l[200005],r[200005],pr[200005];
int main()
{
fastio;
long long t,n,i,mx,lc,rc;
string s;
cin>>t;
while(t--)
{
cin>>n;
mx=0; lc=0; rc=0;
for(i=0;i<n;i++){
cin>>ara[i];
if(i==0)
pr[i]=ara[i];
else
pr[i]=pr[i-1]+ara[i];
}
cin>>s;
for(i=0;i<n;i++)
{
if(s[i]=='L')
{
l[++lc]=i;
}
}
for(i=n-1;i>=0;i--)
{
if(s[i]=='R')
{
r[++rc]=i;
}
}
//cout<<lc<<" "<<rc<<endl;
if(lc==0 || rc==0)
{
cout<<0<<"\n";
continue;
}
// for(i=1;i<=lc;i++)
// cout<<l[i]<<" ";
// cout<<endl;
// for(i=1;i<=rc;i++)
// cout<<r[i]<<" ";
// cout<<endl;
for(i=1;i<=min(lc,rc);i++)
{
if(l[i]>r[i])
break;
else
{
if(l[i]==0)
mx+=pr[r[i]];
else
mx+=pr[r[i]]-pr[l[i]-1];
}
}
cout<<mx<<"\n";
}
return 0;
}