func_code_string: #include <bits/stdc++.h>   using namespace std;   struct he {     int ind;     int val;     he(int ind_ = 0, int val_ = 0) : ind(ind_), val(val_) {}     bool operator<(const he oth) const { return val > oth.val; }   };   int n, m, k;   vector<int> p[200200], c[200200];   int minv[200200], maxv[200200];   int np[200200], nc[200200];   int ans[200200];   queue<int> q;   priority_queue<he> d_cand, id_cand;   int main() {     cin >> n >> m >> k;     for (int i = 1; i <= n; ++i) {       int a;       cin >> a;       if (a == 0) {         minv[i] = 0;         maxv[i] = k + 1;       } else {         minv[i] = a;         maxv[i] = a;       }     }     for (int i = 0; i < m; ++i) {       int a, b;       cin >> a >> b;       p[b].push_back(a);       c[a].push_back(b);     }     for (int i = 1; i <= n; ++i) {       np[i] = p[i].size();       if (np[i] == 0) {         maxv[i] = min(k, maxv[i]);         q.push(i);       }     }     int reached = 0;     while (!q.empty()) {       int ind = q.front();       q.pop();       ++reached;       for (int x : c[ind]) {         maxv[x] = min(maxv[x], maxv[ind] - 1);         --np[x];         if (np[x] == 0) q.push(x);       }     }     if (reached < n) {       cout <<  -1 n ;       return 0;     }     for (int i = 1; i <= n; ++i) {       nc[i] = c[i].size();       if (nc[i] == 0) {         id_cand.push(he(i, minv[i]));       }     }     for (int step = 1; step <= k; ++step) {       while (!id_cand.empty() && id_cand.top().val <= step) {         int x = id_cand.top().ind;         id_cand.pop();         d_cand.push(he(x, maxv[x]));       }       if (d_cand.empty()) {         cout <<  -1 n ;         return 0;       }       int added = 0;       while (!d_cand.empty() && d_cand.top().val == step) {         ++added;         int x = d_cand.top().ind;         d_cand.pop();         ans[x] = step;         for (int y : p[x]) {           --nc[y];           minv[y] = max(minv[y], step + 1);           if (nc[y] == 0) {             id_cand.push(he(y, minv[y]));           }         }       }       if (added == 0) {         int x = d_cand.top().ind;         d_cand.pop();         if (maxv[x] < step) {           cout <<  -1 n ;           return 0;         }         ans[x] = step;         for (int y : p[x]) {           --nc[y];           minv[y] = max(minv[y], step + 1);           if (nc[y] == 0) {             id_cand.push(he(y, minv[y]));           }         }       }     }     for (int i = 1; i <= n; ++i) {       cout << ans[i] <<    ;     }     cout << endl;     return 0;   }   