• Codeforces Round #254 (Div. 2)D(预计)


    D. DZY Loves FFT
    time limit per test
    1 second
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    DZY loves Fast Fourier Transformation, and he enjoys using it.

    Fast Fourier Transformation is an algorithm used to calculate convolution. Specifically, if ab and c are sequences with length n, which are indexed from 0 to n - 1, and

    We can calculate c fast using Fast Fourier Transformation.

    DZY made a little change on this formula. Now

    To make things easier, a is a permutation of integers from 1 to n, and b is a sequence only containing 0 and 1. Given a and b, DZY needs your help to calculate c.

    Because he is naughty, DZY provides a special way to get a and b. What you need is only three integers ndx. After getting them, use the code below to generate a and b.

    //x is 64-bit variable;
    function getNextX() {
        x = (x * 37 + 10007) % 1000000007;
        return x;
    }
    function initAB() {
        for(i = 0; i < n; i = i + 1){
            a[i] = i + 1;
        }
        for(i = 0; i < n; i = i + 1){
            swap(a[i], a[getNextX() % (i + 1)]);
        }
        for(i = 0; i < n; i = i + 1){
            if (i < d)
                b[i] = 1;
            else
                b[i] = 0;
        }
        for(i = 0; i < n; i = i + 1){
            swap(b[i], b[getNextX() % (i + 1)]);
        }
    }
    
    

    Operation x % y denotes remainder after division x by y. Function swap(x, y) swaps two values x and y.

    Input

    The only line of input contains three space-separated integers n, d, x (1 ≤ d ≤ n ≤ 100000; 0 ≤ x ≤ 1000000006). Because DZY is naughty, x can't be equal to 27777500.

    Output

    Output n lines, the i-th line should contain an integer ci - 1.

    Sample test(s)
    input
    3 1 1
    
    output
    1
    3
    2
    
    input
    5 4 2
    
    output
    2
    2
    4
    5
    5
    
    input
    5 4 3
    
    output
    5
    5
    5
    5
    4

    题意:RT

    思路:由于b序列一定仅仅含0或1,那么含0的是没有意义的

                直接for就好了,然后用一个数组is[]记录前多少个b序列为1的位置

                每次要找最大值的时候。假设is[]数组的个数小于一个常数。就枚举is数组

                否则直接从大到小枚举最大值就好了

  • 相关阅读:
    git-for-windows 安装无图标的问题
    开源协议
    根据iframe获取window
    JS的checkbox状态切换dom无变化
    SQL条件!=null查不出数据
    jquery获取select选中项的文本
    泛型擦除
    树形菜单数据结构
    jqgrid动态填充select
    巨坑:jqgrid竟然取不到编辑模式下input的值
  • 原文地址:https://www.cnblogs.com/bhlsheji/p/5205293.html
Copyright © 2020-2023  润新知