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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long lli;
- int main(){
- int Q;
- scanf("%d", &Q);
- for(int q = 1; q <= Q; ++q){
- lli a, b;
- scanf("%lld%lld", &a, &b);
- if(a > b){
- cout << "0\n";
- continue;
- }
- lli ans = (b * b + b - a * a + a) / 2;
- cout << ans << '\n';
- }
- return 0;
- }
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