35 lines
644 B
C++
35 lines
644 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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#define ll long long
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#define endl '\n'
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ll pow(ll x,ll y,ll m=1e9+7){ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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ll n,a,b;
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cin>>n>>a>>b;
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if(a>b)
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{
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cout<<n*a<<endl;
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return;
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}
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ll k;
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k=min(b-a,n);
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ll r=b-k;
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ll ans = (b*b+b)/2-(r*r+r)/2;
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if(k<n)
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ans+=a*(n-k);
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cout<<ans<<endl;
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}
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signed main()
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{
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ios_base::sync_with_stdio(false), cin.tie(nullptr);
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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