diff options
Diffstat (limited to 'count_subarr_max_elem_k.c')
-rw-r--r-- | count_subarr_max_elem_k.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/count_subarr_max_elem_k.c b/count_subarr_max_elem_k.c index e6bf5ad..4768843 100644 --- a/count_subarr_max_elem_k.c +++ b/count_subarr_max_elem_k.c @@ -9,19 +9,15 @@ */ long long countSubarrays(int *nums, int numsSize, int k) { - int max = 0, cnt = 0, idx[numsSize]; + int max = -1, curr = 0; long long ans = 0; - for (int i = 0; i < numsSize; i++) - max = max > nums[i]; - for (int i = 0; i < numsSize; i++) - if (nums[i] == max) - idx[cnt++] = i; - for (int i = 0; i <= cnt - k; i++) { - long long left = idx[i], right = idx[i + k - 1], - bound = i - 1 >= 0 ? idx[i - 1] : -1; - if (!i) - bound = -1; - ans += (left - bound) * (numsSize - right); + for (int i = 0; i < numsSize; ++i) + max = nums[i] > max ? nums[i] : max; + for (int l = 0, r = 0; r < numsSize; r++) { + curr += nums[r] == max; + while (curr >= k) + curr -= nums[l++] == max; + ans += l; } return ans; } |