Designing Efficient Algorithms [Examples]~E - Subsequence
2015-10-31 10:20
501 查看
A sequence of N positive integers (10 < N < 100 000), each of them less than or equal 10000, and a positive integer S (S < 100 000 000) are given. Write a program to find the minimal length of the subsequence of consecutive elements of the sequence, the sum of which is greater than or equal to S.
Input Many test cases will be given. For each test case the program has to read the numbers N and S, separated by an interval, from the first line. The numbers of the sequence are given in the second line of the test case, separated by intervals. The input will finish with the end of file.
Output For each the case the program has to print the result on separate line of the output file.
Sample Input
10 15
5 1 3 5 10 7 4 9 2 8
5 11
1 2 3 4 5
Sample Output
2
3
解题思路:题目意思:有n个正整数组成一个序列。给定整数S,求长度最短的连续序列,使它们的和大于或等于S。
程序代码:
Input Many test cases will be given. For each test case the program has to read the numbers N and S, separated by an interval, from the first line. The numbers of the sequence are given in the second line of the test case, separated by intervals. The input will finish with the end of file.
Output For each the case the program has to print the result on separate line of the output file.
Sample Input
10 15
5 1 3 5 10 7 4 9 2 8
5 11
1 2 3 4 5
Sample Output
2
3
解题思路:题目意思:有n个正整数组成一个序列。给定整数S,求长度最短的连续序列,使它们的和大于或等于S。
程序代码:
#include"stdio.h" #include"algorithm" using namespace std; const int N=100010; int a[N],b[N]; int main() { int n,s,i; while(scanf("%d%d",&n,&s)!=EOF) { for(i=1;i<=n;i++) scanf("%d",&a[i]); b[0]=0; for(i=1;i<=n;i++) b[i]=b[i-1]+a[i]; int ans=n+1; i=1; for(int j=1;j<=n;j++) { if(b[i-1]>b[j]-s)continue; while(b[i]<=b[j]-s)i++; ans=min(ans,j-i+1); } printf("%d\n",ans==n+1?0:ans); } return 0; }
相关文章推荐
- 快速创建一个UIBarButtonItem
- Ligerui表格基本操作(一)
- UIImage的分类
- IOS开发笔记31-UITableView(2)
- AndroidStudio下BuildTypes和ProductFlavors动态编译并重命名apk
- UIdemo UIScrollView
- [转载]UIImage的剪切,尺寸缩小、压缩、添加水印
- UISearchBar 和 UISearchDisplayController 没有在UITableView 的headerView 导致searchResultsTableView的frame出问题
- 【FastDev4Android框架开发】AndroidAnnnotations注入框架使用之第三方框架集成RoboGuice(十三)
- 50. Pow(x, n) (INT; Divide-and-Conquer)
- ValueError: Expecting property name: line 1 column 1 (char 1)
- CodeForces 591A Wizards' Duel
- ui选型
- Arduino UNO仿真开发环境设置和仿真运行
- Codeforces Round #250 (Div. 1) D. The Child and Sequence 线段树 区间求和+点修改+区间取模
- IOS开发笔记30-UITableView(1)
- 报错-Unknown class in Interface Builder file
- UIScrollView语法用法样例
- 贪心-- HDU - 4296 Buildings
- UITextField垂直居中对齐