帖子int solve(vector<int>& maze,int n)

int solve(vector<int>& maze,int n) { int maxSum=-1; for(int i=0; i<n; i++) { int node=i; int sum=0; unordered_set<int> visited; while(node < n && node >= 0 && i!=maze[node] && visited.count(node)==0) { visited.insert(node); sum+=node; node=maze[node]; } if(node>=0 && node < n && i == maze[node]) { maxSum=max(maxSum,sum); } } return maxSum; }