func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     long long a[n];     vector<long long> pref(n + 1, 0);     for (int i = 0; i < n; i++) cin >> a[i];     for (int i = 0; i < n; i++) {       pref[i + 1] = pref[i] + a[i];     }     map<long long, int> m;     m[0] = 0;     long long ans = 0;     int prev = -1;     for (int i = 1; i <= n; i++) {       if (m.find(pref[i]) != m.end()) {         if (m[pref[i]] >= prev - 1) {           ans++;           prev = i;         }       }       m[pref[i]] = i;     }     cout << ans << endl;   }   