diff --git "a/modify_graph_edge_weights/meta.json" "b/modify_graph_edge_weights/meta.json" new file mode 100644--- /dev/null +++ "b/modify_graph_edge_weights/meta.json" @@ -0,0 +1,32555 @@ +{ + "id": 2803, + "name": "modify_graph_edge_weights", + "difficulty": "Hard", + "link": "https://leetcode.com/problems/modify-graph-edge-weights/", + "date": "2023-05-14 00:00:00", + "task_description": "You are given an **undirected weighted** **connected** graph containing `n` nodes labeled from `0` to `n - 1`, and an integer array `edges` where `edges[i] = [ai, bi, wi]` indicates that there is an edge between nodes `ai` and `bi` with weight `wi`. Some edges have a weight of `-1` (`wi = -1`), while others have a **positive** weight (`wi > 0`). Your task is to modify **all edges** with a weight of `-1` by assigning them **positive integer values **in the range `[1, 2 * 109]` so that the **shortest distance** between the nodes `source` and `destination` becomes equal to an integer `target`. If there are **multiple** **modifications** that make the shortest distance between `source` and `destination` equal to `target`, any of them will be considered correct. Return _an array containing all edges (even unmodified ones) in any order if it is possible to make the shortest distance from _`source`_ to _`destination`_ equal to _`target`_, or an **empty array** if it's impossible._ **Note:** You are not allowed to modify the weights of edges with initial positive weights. **Example 1:** **** ``` **Input:** n = 5, edges = [[4,1,-1],[2,0,-1],[0,3,-1],[4,3,-1]], source = 0, destination = 1, target = 5 **Output:** [[4,1,1],[2,0,1],[0,3,3],[4,3,1]] **Explanation:** The graph above shows a possible modification to the edges, making the distance from 0 to 1 equal to 5. ``` **Example 2:** **** ``` **Input:** n = 3, edges = [[0,1,-1],[0,2,5]], source = 0, destination = 2, target = 6 **Output:** [] **Explanation:** The graph above contains the initial edges. It is not possible to make the distance from 0 to 2 equal to 6 by modifying the edge with weight -1. So, an empty array is returned. ``` **Example 3:** **** ``` **Input:** n = 4, edges = [[1,0,4],[1,2,3],[2,3,5],[0,3,-1]], source = 0, destination = 2, target = 6 **Output:** [[1,0,4],[1,2,3],[2,3,5],[0,3,1]] **Explanation:** The graph above shows a modified graph having the shortest distance from 0 to 2 as 6. ``` **Constraints:** `1 <= n <= 100` `1 <= edges.length <= n * (n - 1) / 2` `edges[i].length == 3` `0 <= ai, bi < n` `wi = -1 `or `1 <= wi <= 107` `ai != bi` `0 <= source, destination < n` `source != destination` `1 <= target <= 109` The graph is connected, and there are no self-loops or repeated edges", + "public_test_cases": [ + { + "label": "Example 1", + "input": "n = 5, edges = [[4,1,-1],[2,0,-1],[0,3,-1],[4,3,-1]], source = 0, destination = 1, target = 5", + "output": "[[4,1,1],[2,0,1],[0,3,3],[4,3,1]] " + }, + { + "label": "Example 2", + "input": "n = 3, edges = [[0,1,-1],[0,2,5]], source = 0, destination = 2, target = 6", + "output": "[] " + }, + { + "label": "Example 3", 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int[][] modifiedGraphEdges(int n, int[][] edges, int source, int destination, int target) {\n \n }\n}", + "python_template": "class Solution(object):\n def modifiedGraphEdges(self, n, edges, source, destination, target):\n \"\"\"\n :type n: int\n :type edges: List[List[int]]\n :type source: int\n :type destination: int\n :type target: int\n :rtype: List[List[int]]\n \"\"\"\n " +} \ No newline at end of file