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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int T, i, j, a, b, c;
- scanf("%d", &T);
- for(i = 1; i <= T; i++)
- {
- scanf("%d %d", &a, &b);
- c = 0;
- for(j = a; j <= b; j++)
- {
- if((j%3 == 0 || j%3 == 2) && j != 2)
- c++;
- if(j >= 2 && (b-j)%3 == 0 && b > 5)
- {
- c += 2*(b-j)/3;
- break;
- }
- }
- printf("Case %d: %d\n", i, c);
- }
- }
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