Submission #2372509

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

int main(){
  int N;
  cin >> N;
  vector<ll> in;
  rep(i,N){
    ll a;
    cin >> a;
    in.push_back(a);
  }

  ll ret = 1e18;
  {
    ll tmp = 0;
    vector<ll> v = in;
    ll sum = 0;
    rep(i,v.size()){
      sum += v[i];
      if(i%2==0){
        if(sum >= 0){
          tmp += sum+1;
          sum = -1;
        }
      }else{
        if(sum <= 0){
          tmp += -sum + 1;
          sum = 1;
        }
      }
    }
    ret = min(ret, tmp);
  }
  {
    ll tmp = 0;
    vector<ll> v = in;
    ll sum = 0;
    rep(i,v.size()){
      sum += v[i];
      if(i%2==0){
        if(sum <= 0){
          tmp += -sum+1;
          sum = 1;
        }
      }else{
        if(sum >= 0){
          tmp += sum + 1;
          sum = -1;
        }
      }
    }
    ret = min(ret, tmp);
  }


  cout << ret << endl;

  return 0;
}

Submission Info

Judge Result