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- var frogs = parseInt(readline());
- var t = [];
- var x = [];
- var a = 0, b = 0, k = 0;
- var result;
- for (var i = 0; i < frogs; i++)
- {
- t = readline().split(' ');
- a = parseInt(t[0]);
- b = parseInt(t[1]);
- k = parseInt(t[2]);
- result = a * parseInt(k / 2 + k % 2) - b * parseInt(k / 2);
- x.push(result);
- }
- for ( var i = 0; i < x.length; i++)
- {
- print(x[i]);
- }
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