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| 1 | +/** |
| 2 | + * @param {number[]} nums |
| 3 | + * @param {number} goal |
| 4 | + * @return {number} |
| 5 | + */ |
| 6 | +var minAbsDifference = function(a, b) { |
| 7 | + let n = a.length, m = (n / 2) >> 0, r = n - m; |
| 8 | + let ans = 2e9; |
| 9 | + const {max, min, abs} = Math |
| 10 | + const va = [], vb = []; |
| 11 | + for(let i=0;i<1<<m;++i) { |
| 12 | + let tmp=0; |
| 13 | + for(let j=0;j<m;++j) { |
| 14 | + if(i>>j&1) tmp+=a[j]; |
| 15 | + } |
| 16 | + ans=min(ans,abs(tmp-b)); |
| 17 | + va.push(tmp); |
| 18 | + } |
| 19 | + // sort(va.begin(), va.end()); |
| 20 | + va.sort((a, b) => a - b) |
| 21 | + for(let i=0;i<1<<r;++i) { |
| 22 | + let tmp=0; |
| 23 | + for(let j=0;j<r;++j) { |
| 24 | + if(i>>j&1) tmp+=a[j+m]; |
| 25 | + } |
| 26 | + ans=min(ans,abs(tmp-b)); |
| 27 | + let k=b-tmp; |
| 28 | + let pos=lower_bound(va, k); |
| 29 | + for(let j=pos-1;j<=pos+1;++j) { |
| 30 | + if(j>=0 && j<va.length) { |
| 31 | + ans=min(ans, abs(va[j]+tmp-b)); |
| 32 | + } |
| 33 | + } |
| 34 | + } |
| 35 | + return ans; |
| 36 | +}; |
| 37 | + |
| 38 | +function lower_bound(array, arg1, arg2, arg3, arg4) { |
| 39 | + let first; |
| 40 | + let last; |
| 41 | + let value; |
| 42 | + let less; |
| 43 | + if (arg3 === undefined) { |
| 44 | + first = 0; |
| 45 | + last = array.length; |
| 46 | + value = arg1; |
| 47 | + less = arg2; |
| 48 | + } else { |
| 49 | + first = arg1; |
| 50 | + last = arg2; |
| 51 | + value = arg3; |
| 52 | + less = arg4; |
| 53 | + } |
| 54 | + |
| 55 | + if (less === undefined) { |
| 56 | + less = function (a, b) { return a < b; }; |
| 57 | + } |
| 58 | + |
| 59 | + let len = last - first; |
| 60 | + let middle; |
| 61 | + let step; |
| 62 | + while (len > 0) { |
| 63 | + step = Math.floor(len / 2); |
| 64 | + middle = first + step; |
| 65 | + if (less(array[middle], value, middle)) { |
| 66 | + first = middle; |
| 67 | + first += 1; |
| 68 | + len = len - step - 1; |
| 69 | + } else { |
| 70 | + len = step; |
| 71 | + } |
| 72 | + } |
| 73 | + return first; |
| 74 | +}; |
| 75 | + |
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