hdu 3415 Max Sum of Max-K-sub-sequence

#include<map>
#include<set>
#include<queue>
#include<cmath>
#include<vector>
#include<cstdio>
#include<string>
#include<cstring>
#include<cstdlib>
#include<iostream>
#include<algorithm>
#define  inf 0x0f0f0f0f

using namespace std;
const int maxn=100000+10;
int sum[maxn*2],a[maxn];
int main()
{
    int n,k,t;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d",&n,&k);
        sum[0]=0;
        for (int i=1;i<=n;i++)
        {
            scanf("%d",&a[i]);
            sum[i]=sum[i-1]+a[i];
        }
        for (int i=1;i<=n;i++)
        sum[n+i]=sum[n+i-1]+a[i];
        int start,end,ans=-99999999;
        deque<int>q;
        //q.push_back(0);
        for (int i=1;i<=n+k-1;i++)
        {
            while(!q.empty() && sum[i-1]<sum[q.back()])
            q.pop_back();
            while(!q.empty() && q.front()<i-k)
            q.pop_front();
            q.push_back(i-1);
            if (sum[i]-sum[q.front()]>ans)
            {
                ans=sum[i]-sum[q.front()];
                start=q.front()+1;
                end=i;
            }
        }
        if (end!=n) end%=n;
        printf("%d %d %d\n",ans,start,end);
    }
    return 0;
}