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好水的题啊#include<cstdio>
int main()
{
int T;
scanf("%d",&T);
for(int i=1;i<=T;++i)
{
if(i!=1)printf("\n");
long long a,b;
scanf("%lld%lld",&a,&b);
long long plus=b+a;
long long num=b-a+1;
printf("Scenario #%d:\n%lld\n",i,plus*num/2);
}
return 0;
}
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