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author | Jack Sangdahl <[email protected]> | 2024-11-14 21:49:18 -0700 |
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committer | Jack Sangdahl <[email protected]> | 2024-11-14 21:49:18 -0700 |
commit | 6e0dc08f19d42225935112c849d66db2a5ea63c8 (patch) | |
tree | 67d8579f5c6001089591825024680f3c093181eb /max_height_stacking_cuboids.c | |
parent | baa5c34da7ce05e3cb2006bd04b040fa7da22dce (diff) | |
download | leetcode-6e0dc08f19d42225935112c849d66db2a5ea63c8.tar.gz leetcode-6e0dc08f19d42225935112c849d66db2a5ea63c8.zip |
1691. maximum height by stacking cuboids
Diffstat (limited to 'max_height_stacking_cuboids.c')
-rw-r--r-- | max_height_stacking_cuboids.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/max_height_stacking_cuboids.c b/max_height_stacking_cuboids.c new file mode 100644 index 0000000..22417a4 --- /dev/null +++ b/max_height_stacking_cuboids.c @@ -0,0 +1,74 @@ +// 1691. Maximum Height by Stacking Cuboids +#include "leetcode.h" + +/* + * given 'n' cuboids where the dimensions of the i'th cuboid is 'cuboids[i] = + * [width_i, length_i, height_i]' (0-indexed). choosee a subset of 'cuboids' and + * place them on each other. you can place cuboid 'i' on cuboid 'j' if 'width_i + * <= width_j', and similarily for length and height. you can rearrange any + * cuboid's dimensions by rotating it to put it on another cuboid. return the + * maximum height of the stacked 'cuboids'. + */ + +int cmp_len(const void *a, const void *b) { + int aa = *(int *)a, bb = *(int *)b; + return aa > bb ? 1 : -1; +} + +int cmp_box(const void *a, const void *b) { + int *aa = *(int **)a, *bb = *(int **)b; + if (aa[2] > bb[2]) + return 1; + if (aa[2] < bb[2]) + return -1; + else { + if (aa[1] > bb[1]) + return 1; + if (aa[1] < bb[1]) + return -1; + else { + if (aa[0] > bb[0]) + return 1; + if (aa[0] < bb[0]) + return -1; + else + return 0; + } + } +} + +bool check(int *bottom, int *top) { + return top[2] <= bottom[2] && top[1] <= bottom[1] && top[0] <= bottom[0] + ? false + : true; +} + +int maxHeight(int **cuboids, int cuboidsSize, int *cuboidsColSize) { + for (int i = 0; i < cuboidsSize; i++) + qsort(cuboids[i], 3, sizeof(int), cmp_len); + qsort(cuboids, cuboidsSize, sizeof(cuboids[0]), cmp_box); + int *arr = (int *)malloc(cuboidsSize * sizeof(int)), max = arr[0]; + for (int i = 1; i < cuboidsSize; i++) { + for (int j = 0; j < i; j++) + if (check(cuboids[i], cuboids[j])) + arr[i] = fmax(arr[i], arr[j] + cuboids[i][2]); + max = fmax(max, arr[i]); + } + free(arr); + return max; +} + +int main() { + int c1i[3][3] = {{50, 45, 20}, {95, 37, 53}, {45, 23, 12}}, + c2i[2][3] = {{38, 25, 45}, {76, 35, 3}}, + c3i[6][3] = {{7, 11, 17}, {7, 17, 11}, {11, 7, 17}, + {11, 17, 7}, {17, 7, 11}, {17, 11, 7}}; + struct two_d_arr c1, c2, c3; + two_d_arr_init(&c1, 3, 3, c1i); + two_d_arr_init(&c2, 2, 3, c2i); + two_d_arr_init(&c3, 6, 3, c3i); + printf("%d\n", maxHeight(c1.arr, c1.row_size, c1.col_size)); // expect: 190 + printf("%d\n", maxHeight(c2.arr, c2.row_size, c2.col_size)); // expect: 76 + printf("%d\n", maxHeight(c3.arr, c3.row_size, c3.col_size)); // expect: 102 + two_d_arr_free(&c1), two_d_arr_free(&c2), two_d_arr_free(&c3); +} |