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#include <algorithm>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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int presum(int x)
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{
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return (x >> 1) - x * (x & 1);
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}
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int main()
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{
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int q, l, r;
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scanf("%d", &q);
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while (q--)
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{
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scanf("%d%d", &l, &r);
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printf("%d\n", presum(r) - presum(l - 1));
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}
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return 0;
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} |
