48 lines
817 B
JavaScript
48 lines
817 B
JavaScript
// 0 0 0 0 0
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// 1 0 0 0 1
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// 2 0 0 1 0
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// 3 0 0 1 1
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// 4 0 1 0 0
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// 5 0 1 0 1
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// 6 0 1 1 0
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// 7 0 1 1 1
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// 8 1 0 0 0
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// 9 1 0 0 1
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// 10 1 0 1 0
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// 11 1 0 1 1
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// 12 1 1 0 0
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// 13 1 1 0 1
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// 14 1 1 1 0
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// 15 1 1 1 1
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// count column bits
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function ccb(col, n) {
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let div = (n + 1) / (2 << col);
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let sum = Math.floor(div);
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let rest = Math.max(0, (div - sum) * (2 << col) - (1 << col));
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return sum * (1 << col) + rest;
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}
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// count all bits
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function cab(n) {
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// n < 1e9 => log2(1e9) ~= 30
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let bits = 0;
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for (let i = 0; i < 30; ++i) {
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bits += ccb(i, n);
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}
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return bits;
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}
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// calc between range
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function cbr(a, b) {
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return cab(b) - cab(a-1)
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}
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// for (let i = 0; i < 16; ++i) {
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// console.log(i, cab(i));
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// }
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function countOnes(left, right) {
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return cbr(left, right);
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} |