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// 3479. Fruits Into Baskets III
#include "leetcode.h"
/*
* you are given two arrays of integers, 'fruits' and 'baskets', each of length
* 'n', where 'fruits[i]' represents the quantity of the i'th type of fruit, and
* 'baskets[j]' represents the capacity of the j'th basket. from left to right,
* place the fruits according to these rules: each fruit type must be placed in
* the leftmost available basket with a capacity greater than equal to the
* quantity of that fruit type. return the number of fruit types that remain
* unplaced after all possible allocations are made.
*/
struct node {
int val;
struct node *parent;
struct node *left_child;
struct node *right_child;
};
int tree_size(int n) {
return 1 << (32 - __builtin_clz(n) +
(__builtin_clz(n) + __builtin_clz(n) < 31));
}
int tree_init(struct node *tree, struct node *parent, int icurr, int *data,
int left, int right) {
struct node *curr = &tree[icurr];
curr->parent = parent;
if (left == right) {
curr->left_child = 0;
curr->right_child = 0;
return curr->val = data[left];
} else {
int i_left_child = icurr * 2 + 1, i_right_child = i_left_child + 1,
mid = (left + right) / 2;
curr->left_child = &tree[i_left_child];
curr->right_child = &tree[i_right_child];
int val_left_child = tree_init(tree, curr, i_left_child, data, left, mid);
int val_right_child =
tree_init(tree, curr, i_right_child, data, mid + 1, right);
return curr->val = fmax(val_left_child, val_right_child);
}
}
void set_node_val(struct node *obj, int val) {
obj->val = val;
if (obj->parent) {
struct node *curr = obj->parent;
int new = fmax(curr->left_child->val, curr->right_child->val);
if (new != obj->val)
set_node_val(curr, new);
}
}
struct node *left_node(struct node *tree, const int min) {
struct node *curr = &tree[0];
while (curr->left_child) {
if (curr->left_child->val >= min)
curr = curr->left_child;
else
curr = curr->right_child;
}
return curr;
}
int numOfUnplacedFruits(int *fruits, int fruitsSize, int *baskets,
int basketsSize) {
int ans = 0, n = tree_size(basketsSize);
struct node *tree = (struct node *)malloc(n * sizeof(struct node));
tree_init(tree, (struct node *)0, 0, baskets, 0, basketsSize - 1);
for (int i = 0; i < fruitsSize; i++) {
if (tree[0].val >= fruits[i])
set_node_val(left_node(tree, fruits[i]), 0);
else
ans++;
}
free(tree);
return ans;
}
int main() {
int f1[] = {4, 2, 5}, b1[] = {3, 5, 4};
int f2[] = {3, 6, 1}, b2[] = {6, 4, 7};
printf("%d\n", numOfUnplacedFruits(f1, ARRAY_SIZE(f1), b1,
ARRAY_SIZE(b1))); // expect: 1
printf("%d\n", numOfUnplacedFruits(f2, ARRAY_SIZE(f2), b2,
ARRAY_SIZE(b2))); // expect: 0
}
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