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  1. #include <bits/stdc++.h>
  2. #define endl '\n'
  3. typedef long long ll;
  4. using namespace std;
  5.  
  6. const ll MAXN = 1e5 + 5;
  7. ll a[MAXN], pre[MAXN], suf[MAXN], l[MAXN], r[MAXN], n, ans = LLONG_MIN;
  8.  
  9. void sol() {
  10.    cin >> n;
  11.    for (ll i = 1; i <= n; i++) cin >> a[i];
  12.    for (ll i = 1; i <= n; i++) pre[i] = pre[i - 1] + a[i];
  13.    for (ll i = n; i >= 1; i--) suf[i] = suf[i + 1] + a[i];
  14.    ll minn = 0;
  15.    l[0] = LLONG_MIN;
  16.    for (ll i = 1; i <= n; i++) {
  17.       l[i] = max(l[i - 1], pre[i] - minn);
  18.       if (i == 1) l[i] = max(l[i], a[i]);
  19.       minn = min(minn, pre[i]);
  20.    }
  21.    minn = 0; r[n + 1] = LLONG_MIN;
  22.    for (ll i = n; i >= 1; i--) {
  23.       r[i] = max(r[i + 1], suf[i] - minn);
  24.       if (i == n) r[i] = max(r[i], a[i]);
  25.       minn = min(minn, suf[i]);
  26.    }
  27.    for (ll i = 1; i < n; i++) {
  28.       ans = max(ans, l[i] + r[i + 1]);
  29.    }
  30.    cout << ans << endl;
  31. }
  32.  
  33. int main() {
  34.    ios::sync_with_stdio(0);
  35.    cin.tie(0);
  36.  
  37.    sol();
  38.  
  39.    return 0;
  40. }
  41.  
Success #stdin #stdout 0s 5304KB
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-9223372036854775808
https://ideone.com/nZsug5
language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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