29 lines
575 B
C++
29 lines
575 B
C++
#include <stdio.h>
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#include <string.h>
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#include <iostream>
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#include <algorithm>
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#include <vector>
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#include <queue>
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#include <set>
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#include <map>
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#include <string>
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#include <math.h>
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#include <stdlib.h>
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#include <time.h>
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using namespace std;
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int main()
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{
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int T;
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int iCase = 0;
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scanf("%d",&T);
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long long a,b;
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while(T--){
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iCase++;
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scanf("%I64d%I64d",&a,&b);
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a--;
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long long ans = (b*(b+1)/2)*(b*(b+1)/2) - (a*(a+1)/2)*(a*(a+1)/2);
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printf("Case #%d: %I64d\n",iCase,ans);
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}
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return 0;
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}
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