编程介的小学生 2017-06-22 02:18 采纳率: 20.5%
浏览 683
已采纳

Binary Indexed Tree

Problem Description
Recently, Mr. Frog has learned binary indexed tree. Here is the code of adding t to the interval [1,x]:

void add (int x, int t ){
    for (int i = x; i != 0; i -= i & (-i))
        a[i] += t;
}

If Mr. Frog is required to add t to the interval [l,r], he will add(r,t), and then add(l - 1,-t).

The cost of an interval [l,r] is defined as the number of the “really changed point”. The “really changed point” is the point whose value is modified by the given code.

For example, in order to add 1 to the interval [6,6], Mr. Frog will add 1 to the interval 1,6, and add -1 to the interval 1,5.

As the result, a[6] will be added by 1, a[5] will be added by -1, and a[4] will be added by 0. a[6] and a[5] are “really changed point”, and the cost is 2.

Mr. Frog wants to calculate the sum of the cost of the interval [l,r]⊆ [1,n] where l and r are two integers. Help Mr. Frog solve the problem.

Input
The first line contains only one integer T (T≤10000), which indicates the number of test cases.

For each test case, it contains an integer n (1≤n≤1018).

Output
For each test case, output one line ”Case #x: y”, where x is the case number (starting from 1), y is the sum of the cost (modulo 1000000007).

Sample Input
3
1
2
3

Sample Output
Case #1: 1
Case #2: 4
Case #3: 10

  • 写回答

1条回答 默认 最新

  • threenewbee 2017-07-20 13:36
    关注
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥15 为什么使用javacv转封装rtsp为rtmp时出现如下问题:[h264 @ 000000004faf7500]no frame?
  • ¥15 乘性高斯噪声在深度学习网络中的应用
  • ¥15 运筹学排序问题中的在线排序
  • ¥15 关于docker部署flink集成hadoop的yarn,请教个问题 flink启动yarn-session.sh连不上hadoop,这个整了好几天一直不行,求帮忙看一下怎么解决
  • ¥30 求一段fortran代码用IVF编译运行的结果
  • ¥15 深度学习根据CNN网络模型,搭建BP模型并训练MNIST数据集
  • ¥15 C++ 头文件/宏冲突问题解决
  • ¥15 用comsol模拟大气湍流通过底部加热(温度不同)的腔体
  • ¥50 安卓adb backup备份子用户应用数据失败
  • ¥20 有人能用聚类分析帮我分析一下文本内容嘛