• 暴力&打表


    _LH巨神好像不太会打表,这里来普及一下

    还有暴力这么重要的东西网上讲的人竟然不多……

    一.打表

    打表,就是针对一些输入数据比较小的题目的一种骗分技巧,当然有时候也可以在正解或暴力中起一定优化作用。

    例题:

    奇怪的道路

    小宇从历史书上了解到一个古老的文明。这个文明在各个方面高度发达,交通方面也不例外。考古学家已经知道,这个文明在全盛时期有n座城市,编号为1..n。m条道路连接在这些城市之间,每条道路将两个城市连接起来,使得两地的居民可以方便地来往。一对城市之间可能存在多条道路。 据史料记载,这个文明的交通网络满足两个奇怪的特征。首先,这个文明崇拜数字K,所以对于任何一条道路,设它连接的两个城市分别为u和v,则必定满足1 <=|u - v| <= K。此外,任何一个城市都与恰好偶数条道路相连(0也被认为是偶数)。不过,由于时间过于久远,具体的交通网络我们已经无法得知了。小宇很好奇这n个城市之间究竟有多少种可能的连接方法,于是她向你求助。 方法数可能很大,你只需要输出方法数模1000000007后的结果。输入共一行,为3个整数n,m,K。输出1个整数,表示方案数模1000000007后的结果。100%的数据满足1<= n <= 30, 0 <= m <= 30, 1 <= K <= 8.两种可能的连接方法不同当且仅当存在一对城市,它们间的道路数在两种方法中不同。在交通网络中,有可能存在两个城市无法互相到达。

    样例

    样例输入

     3 4 1

    样例输出

     3

    题解

    标准打表题,暴力跑出后打成表就AC了

    #include<bits/stdc++.h>
    using namespace std;
    int 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3,47252436,237336,7509215,75849681,444258387,875167573,326100802,71784664,291524911,0,15839068,290554498,369907086,596761540,806277922,17550276,466297428,1344904,88888218,596993040,771929606,800045419,768717185,627291033,225935811,0,208164262,396412526,545042045,55971604,823821553,67943828,942511744,6724520,942719094,652620989,556898297,330537368,478549381,443863967,539735808,0,352206378,477364399,543238700,530043160,446518094,118014733,523115656,30260340,98850933,652277016,687520562,699915333,60255797,521932769,397723703,0,481425779,104175988,460853369,113482160,975753847,142004378,706767058,124403620,757594100,767891803,212361843,123164471,300733034,911339168,813527344,0,117694771,853156476,492087676,812158545,952575900,129480393,391024011,472733756,80084616,248783034,357802079,437569768,793625806,941035414,846414572,0,964889689,233304343,840627368,927016078,709917342,206623582,855548252,676056037,924392372,758556584,429461916,401873011,30174409,818276362,925920867,0,493830902,930173836,63283080,380981345,797070332,275915045,779180592,586853445,164658914,149343171,160865609,635628977,39727486,693325525,787535425,0,76612472,170218958,803874415,232669876,944792822,216807522,397737658,620076241,646515533,499611139,989633245,159076189,517411608,911032206,864759288,0,197952609,342740002,33199783,189777211,411872674,627690142,367901744,860228716,968080215,89505587,869864117,14597641,793299398,363246663,986982171,0,276114524,375756712,736606180,655057692,864313306,985826255,191786946,532655639,36571349,488218396,457088350,244633725,177956313,145979048,201860393};
    int main()
    {
        int n,m,k;
        scanf("%d%d%d",&n,&m,&k);
        cout<<ans[n-1][m][k-1]<<endl;
        return 0;
    }
    View Code

    当然打表的形式多种多样,例题中的表只是最常见的一种。

    列举一些常用的表:

    1.素数表

    2.阶乘表

    3.逆元表

    当然打表并不一定要直接初始化,也可以通过线性筛/递推打出,所谓预处理其实就是优雅的打表。

    打表也不一定要全打出,如果小的点暴力足够拿分就不必费事费力,只打出极限数据就好,这叫做信仰打表。

    一般来说毒瘤出题人都卡着数据极限范围出数据

    打表程序如下:

    #include<bits/stdc++.h>
    using namespace std;
    int work(int x){
        return 1;
    }
    int main(){
        freopen("1.out","w",stdout);
        int x=1001;
        printf("#include<cstdio>
    using namespace std;
    int a[%d]={0",x);//想打多少就设它加1,如想打1000个x就为1001
        for(register int i=1;i<x;++i)
            printf(",%d",work(i));//work就是暴力,work(i)就是由题目条件得出的结果
        printf("};
    int main(){
        
        return 0;
    }");
        return 0;
    }
    //把1.out粘贴出来自己加个输入输出就行了
    //linux可以多开几个终端打不同部分的表,最后合并
    View Code

    二.暴力

    暴力形式就多种多样了,列举常见的几种。

    1.暴搜

    最常见的暴力形式,灵活多变,绝大部分题目都有暴搜的解法。

    般采用dfs,当然极个别题目用到了bfs。

    2.dp

    一些题目正解很难想到,但一些复杂度极高的dp($Theta(2^N)$,$Theta(N^4)$)等却能很快想到。

    这时我们不妨先打出这样的dp再想正解。

    3.状压

    个别题的送分形式。一般来说数据范围小于20可考虑。

    4.打表

    已经详细讲解,不再赘述。

    5.贪心

    可能是错解,不过不妨一试。

    6.Hash

    字符串常用暴力手段,简单粗暴。

    7.分块&莫队

    优雅的暴力形式(莫队奇偶性排序加O2碾爆正解

    8.Simpson积分

    虽说是暴力,然而我其实并不会用…………

    9.随机化

    有的时候可以碾爆正解哦~

    还有许多其他手段。

    注意考试除非一下就想到正解,否则必打暴力。

    就算打出正解,暴力也可以成为对拍利器。

    不过暴力虽好,但不能满足于暴力,仍然要积极想正解,只会暴力永远平庸,正解才会让你脱颖而出。

    end

    rp++
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  • 原文地址:https://www.cnblogs.com/remarkable/p/11231660.html
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