Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration (that must be going through a defiant phase: "But I want to use feet, not meters!"). Each signal seems to come in two parts: a sequence of n integer values and a non-negative integer t. We'll not go into details, but researchers found out that a signal encodes two integer values. These can be found as the lower and upper bound of a subrange of the sequence whose absolute value of its sum is closest to t.
You are given the sequence of n integers and the non-negative target t. You are to find a non-empty range of the sequence (i.e. a continuous subsequence) and output its lower index l and its upper index u. The absolute value of the sum of the values of the sequence from the l-th to the u-th element (inclusive) must be at least as close to t as the absolute value of the sum of any other non-empty range.
Input
The input file contains several test cases. Each test case starts with two numbers n and k. Input is terminated by n=k=0. Otherwise, 1<=n<=100000 and there follow n integers with absolute values <=10000 which constitute the sequence. Then follow k queries for this sequence. Each query is a target t with 0<=t<=1000000000.
Output
For each query output 3 numbers on a line: some closest absolute sum and the lower and upper indices of some range where this absolute sum is achieved. Possible indices start with 1 and go up to n.
Sample
Inputcopy | Outputcopy |
---|---|
5 1 -10 -5 0 5 10 3 10 2 -9 8 -7 6 -5 4 -3 2 -1 0 5 11 15 2 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 15 100 0 0 | 5 4 4 5 2 8 9 1 1 15 1 15 15 1 15 |
- #include<iostream>
- #include<algorithm>
- #include<map>
- #include<cstring>
- #include<vector>
- #include<cmath>
- #include<cstdlib>
-
- using namespace std;
- const int N = 1e5 + 10;
- const int INF = 0x3f3f3f3f;
- int n, k;
- vector<pair<int, int>> b;
-
- struct node {
- int num; //数值
- int id; //位置
- int sum; //前缀和
- }a[N];
-
- bool cmp(node a, node b)
- {
- return a.sum < b.sum;
- }
-
- int main()
- {
- while (cin>>n>>k && (n || k))
- {
- //读入数据
- a[0].num = a[0].id = a[0].sum = 0;
- for (int i = 1; i <= n; i++)
- {
- cin >> a[i].num;
- a[i].id = i;
- a[i].sum = a[i - 1].sum + a[i].num;
- }
-
- sort(a, a + n + 1, cmp); //按照前缀和从小到大排序
- int t;
- while (k--)
- {
- cin >> t;
- int ans = 0, ansl = 0, ansr = 0;
- int left = 0, right = 1;
- int minsum = INF,temp;
- while (left <= n && right <= n)
- {
- temp = abs(a[right].sum - a[left].sum); //每次计算从l到r的前缀和
- if (abs(temp - t) < minsum) //如果temp与t的距离更,则更新最小的距离minsum,左端点和右端点
- {
- minsum = abs(temp - t);
- ans = temp;
- ansl = a[left].id < a[right].id ? a[left].id + 1 : a[right].id + 1; //左端点要加一,不然案例一的答案就不是4 4,而是3 4
- ansr = a[left].id < a[right].id ? a[right].id : a[left].id;
- }
-
- if (temp < t) right++; //如果temp小于t,就往大的找,尽量降低最小距离
- else if (temp > t) left++;//道理同上
- else break;
-
- if (left == right) right++;
- }
-
- cout << ans << " " << ansl << " " << ansr << endl;
- }
- }
-
- return 0;
- }