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#include <iostream> #include <map> #include <set> #include <vector> using namespace std; typedef long long ll; int main() { int n; cin >> n; vector<ll> v(n); map<ll, vector<int>> mapa; ll sum = 0, result = 0; for(int i = 0; i < n; i++) { cin >> v[i]; sum += v[i]; mapa[sum].push_back(i); } sum = 0; for(int i = n - 1; i >= 0; i--) { sum += v[i]; if(mapa.count(sum)) { if(mapa[sum][0] < i) { result = max(result, sum); } } } cout << result << endl; return 0; }
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