33 lines
535 B
C++
33 lines
535 B
C++
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#include<bits/stdc++.h>
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using namespace std;
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using ll = long long;
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void solve()
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{
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int n;
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cin>>n;
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int a[n];
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for(int i=0; i<n; i++)
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{
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cin>>a[i];
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}
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int ct=0;
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for(int i=0, j=n-1; i<j; i++, j--)
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{
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if(a[i]==1 && a[j]==0) ct++;
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else if(a[i]==1 && a[j]==1) i--;
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else if(a[i]==0 && a[j]==0) j++;
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}
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cout<<ct<<endl;
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}
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int main()
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{
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ios_base::sync_with_stdio(false);
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cin.tie(nullptr);
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int TC = 1;
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cin >> TC;
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cin.ignore();
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while (TC--) solve();
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}
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