hdu3415 Max Sum of Max-K-sub-sequence
2012-07-13 09:13
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Max Sum of Max-K-sub-sequence
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3193 Accepted Submission(s): 1136
Problem Description
Given a circle sequence A[1],A[2],A[3]......A
. Circle sequence means the left neighbour of A[1] is A
, and the right neighbour of A
is A[1].
Now your job is to calculate the max sum of a Max-K-sub-sequence. Max-K-sub-sequence means a continuous non-empty sub-sequence which length not exceed K.
Input
The first line of the input contains an integer T(1<=T<=100) which means the number of test cases.
Then T lines follow, each line starts with two integers N , K(1<=N<=100000 , 1<=K<=N), then N integers followed(all the integers are between -1000 and 1000).
Output
For each test case, you should output a line contains three integers, the Max Sum in the sequence, the start position of the sub-sequence, the end position of the sub-sequence. If there are more than one result, output the minimum start position, if still more
than one , output the minimum length of them.
Sample Input
4 6 3 6 -1 2 -6 5 -5 6 4 6 -1 2 -6 5 -5 6 3 -1 2 -6 5 -5 6 6 6 -1 -1 -1 -1 -1 -1
Sample Output
7 1 3 7 1 3 7 6 2 -1 1 1
Author
shǎ崽@HDU
Source
HDOJ Monthly Contest – 2010.06.05
Recommend
lcy
单调队列。
设sum[i]为从头到第i个数的和,然后就是维护距离为k的最小sum值,答案就是sum[i]-sum[min],可以用双端队列的stl做,不过不会太简化代码量。
#include <stdio.h> #define INF 999999999 typedef struct { int val,num,now; }Queue; int a[200005]; int sum[200005]; Queue q[200005]; int main() { int front,tail,k,i,j,n,T; Queue ans; scanf("%d",&T); while(T--) { scanf("%d%d",&n,&k); for (i=1;i<=n;i++) { scanf("%d",&a[i]); } for (i=n+1;i<=2*n;i++) { a[i]=a[i-n]; } n=2*n; sum[0]=0; for (i=1;i<=n;i++) { sum[i]=sum[i-1]+a[i]; } front=tail=1; ans.val=-INF; for (i=1;i<=n;i++) { while(tail>front && sum[i-1]<q[tail-1].val) tail--; q[tail].val=sum[i-1]; q[tail].num=i-1; tail++; if (i-q[front].num>k) front++; if (sum[i]-q[front].val>ans.val) { ans.val=sum[i]-q[front].val; ans.num=q[front].num+1; ans.now=i; } } printf("%d %d %d\n",ans.val,ans.num,ans.now-n/2>0?ans.now-n/2:ans.now); } return 0; }
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