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auto odds = [] (ll a, ll b) -> ll {
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if (a % 2 == 0) a += 1;
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if (b % 2 == 0) b -= 1;
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if (a > b) return 0;
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ll odd_sum = ((b + 1) / 2) * ((b + 1) / 2) - ((a - 1) / 2) * ((a - 1) / 2);
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return odd_sum;
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};
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auto oddcount = [] (ll a, ll b) -> ll {
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return (b - a) / 2 + (a & 1 | b & 1);
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};
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