func_code_string: #include <bits/stdc++.h>   const long long mod = 1e9 + 9;   using namespace std;   const long long N = 105;   long long vis[N], l[N], who[N], n, m;   void fail() {     cout <<  -1 n ;     exit(0);   }   int32_t main() {     cin >> n >> m;     for (long long i = 1; i <= m; i++) cin >> l[i];     long long cur = l[1];     for (long long i = 2; i <= m; i++) {       long long dif = (l[i] - cur);       if (dif <= 0) dif += n;       if (vis[dif] && vis[dif] != cur) fail();       who[cur] = dif;       vis[dif] = cur;       cur = l[i];     }     long long cnt = 0;     set<long long> st;     for (long long i = 1; i <= n; i++) {       if (!vis[i]) {         st.insert(i);       }       if (!who[i]) cnt++;     }     auto it = st.begin();     if (cnt > st.size()) fail();     for (long long i = 1; i <= n; i++) {       if (who[i])         cout << who[i];       else {         cout << *it;         it++;       }       cout <<    ;     }     return 0;   }   