// UVa 10783 - Odd Sum #include <iostream> #include <stdio.h> using namespace std; int main() { int tt; cin >> tt; for (int t = 1; t <= tt; t++) { int a, b; cin >> a >> b; if (a % 2) a--; if (b % 2) b++; a = a >> 1; b = b >> 1; int sol = b * b - a * a; printf("Case %d: %d\n", t, sol); } return 0; }
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