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lintcode:127 · 拓扑排序
2022-06-12 20:47:00 【OceanStar的学习笔记】
题目来源
题目描述
#include <vector>
using namespace std;
struct DirectedGraphNode {
int label;
vector<DirectedGraphNode *> neighbors;
DirectedGraphNode(int x) : label(x) {
};
};
class Solution {
public:
/** * @param graph: A list of Directed graph node * @return: Any topological order for the given graph. */
vector<DirectedGraphNode*> topSort(vector<DirectedGraphNode*> graph) {
// write your code here
}
};
题目解析
拓扑序的实际意义是:按照这个顺序,在每个项目开始时,能够保证它的前驱活动都已完成,从而使整个工程顺利进行。
注意,有时候拓扑序并不是唯一的,所以面试的时候要问下面试官,是要求解任意解,还是列出所有解。
DFS
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