lc743 network delay time

int (vector<vector<int>>& times, int N, int K) {
       vector<int> nodes(N+1, INT_MAX);
       nodes[K] = 0;
       for(int i = 0; i < N; i++){
       for(vector<int> t : times){
           int u = t[0];
           int v = t[1];
           int w = t[2];
           if(nodes[u] != INT_MAX && nodes[u] + w < nodes[v])
               nodes[v] = nodes[u] + w;
       }
       }
       int res = INT_MIN;
       for(int i = 1; i <= N; i++){
           res = max(res, nodes[i]);
       }
       return res == INT_MAX ? -1 : res;
}