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#include <cstdio>
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using namespace std;
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int main()
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{
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long long T, a, b, k;
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scanf("%lld", &T);
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while (T--)
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{
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scanf("%lld%lld%lld", &a, &b, &k);
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if (k & 1)
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printf("%lld\n", (a - b)*(k >> 1) + a);
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else
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printf("%lld\n", (a - b)*(k >> 1));
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}
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return 0;
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} |
