# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
43769 | PowerOfNinjaGo | Hacker (BOI15_hac) | C++14 | 96 ms | 32504 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//Power Of Ninja Go
#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii;
#define X first
#define Y second
#define vi vector<int>
#define vii vector< ii >
#define pb push_back
const int maxn = 5e5+5;
int arr[2*maxn];
int qs[2*maxn];
int s[2*maxn];
int main()
{
//#ifndef atom freopen(".in", "r", stdin); freopen(".out", "w", stdout); #endif
int n; scanf("%d", &n);
for(int i = 1; i<= n; i++) scanf("%d", arr+i);
for(int i = 1; i<= n; i++) arr[n+i] = arr[i];
for(int i = 1; i<= 2*n; i++) qs[i] = qs[i-1]+arr[i];
int k = n/2;
for(int i = 1; i+k-1<= 2*n; i++) s[i] = qs[i+k-1]-qs[i-1];
int best = 2e9;
deque< ii > dq;
for(int i = 2; i< n-k+1; i++)
{
while(!dq.empty() && dq.back().X<= s[i]) dq.pop_back();
dq.push_back(ii(s[i], i));
}
for(int i = 1; i<= n; i++)
{
while(!dq.empty() && dq.back().X<= s[n-k+i]) dq.pop_back();
dq.push_back(ii(s[n-k+i], n-k+i));
while(!dq.empty() && dq.front().Y<= i) dq.pop_front();
best = min(best, dq.front().X);
}
printf("%d\n", qs[n]-best);
}
Compilation message (stderr)
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