#907Winterim Backpacking Trip

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時間限制：2000 毫秒記憶體限制：64 MB

This Winter we are going on a trip along the Appalachian Trail. The trail is a continuous marked footpath that goes from Katahdin in Maine to Springer Mountain in Georgia, a distance of about 2160 miles. Even though our trip will only consider some part of the trail, it will be our first real backpacking experience and an excellent opportunity to acquire winter camping skills.

Part of the experience is also the route planning of the trip. We have a list of all possible campsites that we can use along the way and we want to do this trip so that we only stop K nights to camp. We also know in advance the distance between consecutive campsites and we are only allowed to camp at a campsite. Our goal is to plan the trip so that we minimise the maximum amount of walking done in a single day. In other words, if our trip involves 2 nights (3 days of walking), and we walk 9, 10, 5 miles on each day respectively, the cost (maximum amount of walking done in one day) is 10. Another schedule that involves walking 9, 6, 9 miles on each day has cost 9.

Given the distances between N consecutive campsites of a trail and given the number of nights for your trip, K, your task is to devise a camping strategy for the specified trail such that it minimises the maximum amount of walking done in a single day. Note that the first distance value given is the distance from our start-point of the trail to our 1st campsite, and the last distance value given is the distance from our N -th campsite to our end-point of the trail.

範例輸入 1

範例輸出 1

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Input

The input file contains several test cases, each of them as describes below.

The first line of input consists of two numbers, the number of campsites (0 < N ≤ 600) and the number of nights of the trip (0 ≤ K ≤ 300). The following N + 1 input lines indicate the distance in miles between consecutive campsite locations.

Output

For each test case, on a line by itself, your program must output the maximum amount of walking in a single day for the route that minimises such value.

LOCAL platform clarification

Segment distances are nonnegative integers. Additional nights may be spent at an existing campsite without walking that day. Thus K may exceed N; minimize the maximum walking distance over K+1 days, including any zero-walking rest days.