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author | Jack Sangdahl <[email protected]> | 2025-04-04 23:34:14 -0600 |
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committer | Jack Sangdahl <[email protected]> | 2025-04-04 23:34:14 -0600 |
commit | f8d9a0c6ef10d434749cbc0d9ae51b1482aad1b6 (patch) | |
tree | a8549ed421b21c5bafa829e5cacda3ae53d9ef01 /sum_subset_xor.c | |
parent | 6e2b4dac24efabc44781551afdb9d1723849ae62 (diff) | |
download | leetcode-f8d9a0c6ef10d434749cbc0d9ae51b1482aad1b6.tar.gz leetcode-f8d9a0c6ef10d434749cbc0d9ae51b1482aad1b6.zip |
1863. sum of all subset xor totals
Diffstat (limited to 'sum_subset_xor.c')
-rw-r--r-- | sum_subset_xor.c | 23 |
1 files changed, 4 insertions, 19 deletions
diff --git a/sum_subset_xor.c b/sum_subset_xor.c index cb51647..7c32618 100644 --- a/sum_subset_xor.c +++ b/sum_subset_xor.c @@ -8,26 +8,11 @@ * if 'a' can be obtained from 'b' by deleting some elements of 'b'. */ -void backtrack(int *nums, int numsSize, int tar, int idx, int *cnt) { - if (idx == numsSize) { - return; - } else { - for (int i = idx; i < numsSize; i++) { - tar ^= nums[i]; - *cnt += tar; - backtrack(nums, numsSize, tar, i + 1, cnt); - tar ^= nums[i]; - } - } -} - int subsetXORSum(int *nums, int numsSize) { - int ans = 0; - for (int i = 0; i < numsSize; i++) { - ans += nums[i]; - backtrack(nums, numsSize, nums[i], i + 1, &ans); - } - return ans; + int all = 0, mult = 1 << (numsSize - 1); + for (int i = 0; i < numsSize; i++) + all |= nums[i]; + return all * mult; } int main() { |