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Diffstat (limited to 'count_good_triplets.c')
-rw-r--r-- | count_good_triplets.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/count_good_triplets.c b/count_good_triplets.c new file mode 100644 index 0000000..9275841 --- /dev/null +++ b/count_good_triplets.c @@ -0,0 +1,29 @@ +// 1534. Count Good Triplets +#include "leetcode.h" + +/* + * given an array of integers 'arr', and three integers 'a, b, c', yo need to + * find the number of good triplets. a triplet '(arr[i], arr[j], arr[k])' is + * good if the following conditions are met: '0 <= i < j < k < arr.len, |arr[i] + * - arr[j]| <= (a, b, c)' where '|x|' denotes the absolute value of 'x'. return + * the number of good triplets. + */ + +int countGoodTriplets(int *arr, int arrSize, int a, int b, int c) { + int cnt = 0; + for (int i = 0; i < arrSize - 2; i++) + for (int k = i + 2; k < arrSize; k++) { + if (abs(arr[k] - arr[i]) > c) + continue; + for (int j = i + 1; j < k; j++) + if (abs(arr[i] - arr[j]) <= a && abs(arr[j] - arr[k]) <= b) + ++cnt; + } + return cnt; +} + +int main() { + int a1[] = {3, 0, 1, 1, 9, 7}, a2[] = {1, 1, 2, 2, 3}; + printf("%d\n", countGoodTriplets(a1, ARRAY_SIZE(a1), 7, 2, 3)); // expect: 4 + printf("%d\n", countGoodTriplets(a2, ARRAY_SIZE(a2), 0, 0, 1)); // expect: 0 +} |