func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX_N = 1e5 + 5;   const int M = 1e6;   const long long INF = (long long)(1e18);   const int inf = 1e9;   const long long MOD = 1000000007LL;   long long n, m;   long long a[MAX_N];   long long ans[MAX_N];   long long suff[MAX_N];   void solve() {}   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cin >> n >> m;     long long s = 0LL;     for (long long i = 1; i <= m; i++) {       cin >> a[i];       s += a[i];     }     bool ok = true;     for (long long i = 1; i <= m; i++) {       if (i - 1 + a[i] > n) {         ok = false;         break;       }     }     if (s < n || !ok) {       cout << -1;       return 0;     }     for (long long i = m; i >= 1; i--) {       suff[i] = suff[i + 1] + a[i];       ans[i] = max(i, n - suff[i] + 1);     }     for (long long i = 1; i <= m; i++) {       cout << ans[i] <<    ;     }     return 0;   }   