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return r % 2 == 0 ? (10*(r/2 - 1) + 1) + (2*c - 2) : 10*((r+1)/2 - 1) + 2*(c-1)
or
return r % 2 == 0 ? 5*r - 11 + 2*c : 5*r - 7 + 2*c
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Strange Grid Again
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return r % 2 == 0 ? (10*(r/2 - 1) + 1) + (2*c - 2) : 10*((r+1)/2 - 1) + 2*(c-1)or
return r % 2 == 0 ? 5*r - 11 + 2*c : 5*r - 7 + 2*c