#Leetcode# 997. Find the Town Judge
2024-08-25 14:04:47
https://leetcode.com/problems/find-the-town-judge/
In a town, there are N
people labelled from 1
to N
. There is a rumor that one of these people is secretly the town judge.
If the town judge exists, then:
- The town judge trusts nobody.
- Everybody (except for the town judge) trusts the town judge.
- There is exactly one person that satisfies properties 1 and 2.
You are given trust
, an array of pairs trust[i] = [a, b]
representing that the person labelled a
trusts the person labelled b
.
If the town judge exists and can be identified, return the label of the town judge. Otherwise, return -1
.
Example 1:
Input: N = 2, trust = [[1,2]]
Output: 2
Example 2:
Input: N = 3, trust = [[1,3],[2,3]]
Output: 3
Example 3:
Input: N = 3, trust = [[1,3],[2,3],[3,1]]
Output: -1
Example 4:
Input: N = 3, trust = [[1,2],[2,3]]
Output: -1
Example 5:
Input: N = 4, trust = [[1,3],[1,4],[2,3],[2,4],[4,3]]
Output: 3
Note:
1 <= N <= 1000
trust.length <= 10000
trust[i]
are all differenttrust[i][0] != trust[i][1]
1 <= trust[i][0], trust[i][1] <= N
代码:
class Solution {
public:
vector<int> v[1010];
int vis[1010];
int findJudge(int N, vector<vector<int>>& trust) {
int n = trust.size(); for(int i = 0; i < n; i ++) {
int a = trust[i][0], b = trust[i][1];
v[b].push_back(a);
vis[a] = 1;
} int cnt = 0, temp = 0;
for(int i = 1; i <= N; i ++) {
if(vis[i] == 0 && v[i].size() == N - 1) {
cnt ++;
temp = i;
}
}
if(cnt == 1) return temp;
return -1;
}
};
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