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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int sum, n, a[1000009], a1[1000009];
  4. int duyet , duyet1, maxn , maxn1 , ans;
  5. void inp(){
  6.     cin >> n;
  7.     for (int i = 1; i <= n; i++){
  8.         cin >> a[i];
  9.         a1[i] = (-1) * a[i];
  10.         sum += a[i];
  11.     }
  12. }
  13. int kadane(){
  14.     for (int i = 1; i <= n; i++){
  15.         duyet += a[i];
  16.         if (duyet < 0){
  17.             duyet = 0;
  18.         }
  19.         maxn = max (maxn, duyet);
  20.     }
  21.     int tong1 = maxn;
  22.     for (int i = 1; i <= n; i++){
  23.         duyet1 += a1[i];
  24.         if (duyet1 < 0){
  25.             duyet1 = 0;
  26.         }
  27.         maxn1 = max (maxn1, duyet1);
  28.     }
  29.     int tong2 = sum - ((-1)*maxn1);
  30.     if (maxn1 + sum == 0){
  31.         return tong1;
  32.     }
  33.     ans = max (tong1, tong2);
  34.     return ans;
  35. }
  36. int main(){
  37.     ios_base::sync_with_stdio(false);
  38.     cin.tie(0); cout.tie(0);
  39.     freopen("CAU3.INP", "r", stdin);
  40.     freopen("CAU3.OUT", "w", stdout);
  41.     inp();
  42.     cout << kadane();
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/GC6SeP
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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