LeetCode 1042: Flower Planting With No Adjacent Solution
Master LeetCode problem 1042 (Flower Planting With No Adjacent), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
1042. Flower Planting With No Adjacent
Problem Explanation
Explanation:
To solve this problem, we can use a greedy coloring algorithm. We start by initializing an array to store the flower types for each garden. Then, for each garden, we check the types of flowers used in its neighboring gardens and assign the lowest available flower type that is not used by its neighbors.
- Create a graph representation using adjacency list from the given paths.
- Initialize an array to store the flower types for each garden.
- Iterate through each garden and assign a flower type based on its neighbors.
- Return the array of flower types as the final answer.
Time Complexity: O(N + E), where N is the number of gardens and E is the number of paths. Space Complexity: O(N), where N is the number of gardens.
:
Solution Code
class Solution {
public int[] gardenNoAdj(int n, int[][] paths) {
List<List<Integer>> graph = new ArrayList<>();
for (int i = 0; i < n; i++) {
graph.add(new ArrayList<>());
}
for (int[] path : paths) {
int x = path[0] - 1;
int y = path[1] - 1;
graph.get(x).add(y);
graph.get(y).add(x);
}
int[] colors = new int[n];
for (int i = 0; i < n; i++) {
boolean[] usedColors = new boolean[5];
for (int neighbor : graph.get(i)) {
usedColors[colors[neighbor]] = true;
}
for (int j = 1; j <= 4; j++) {
if (!usedColors[j]) {
colors[i] = j;
break;
}
}
}
return colors;
}
}Try It Yourself
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