zoukankan      html  css  js  c++  java
  • nyoj 43 24 Point game(dfs暴力)

     

    描述
    There is a game which is called 24 Point game.
    
    In this game , you will be given some numbers. Your task is to find an expression which have all the given numbers and the value of the expression should be 24 .The expression mustn't have any other operator except plus,minus,multiply,divide and the brackets. 
    
    e.g. If the numbers you are given is "3 3 8 8", you can give "8/(3-8/3)" as an answer. All the numbers should be used and the bracktes can be nested. 
    
    Your task in this problem is only to judge whether the given numbers can be used to find a expression whose value is the given number。
    
     
    输入
    The input has multicases and each case contains one line
    The first line of the input is an non-negative integer C(C<=100),which indicates the number of the cases.
    Each line has some integers,the first integer M(0<=M<=5) is the total number of the given numbers to consist the expression,the second integers N(0<=N<=100) is the number which the value of the expression should be.
    Then,the followed M integer is the given numbers. All the given numbers is non-negative and less than 100
    输出
    For each test-cases,output "Yes" if there is an expression which fit all the demands,otherwise output "No" instead.
    样例输入
    2
    4 24 3 3 8 8
    3 24 8 3 3
    样例输出
    Yes
    No

    深搜枚举各种可能。

     1 #pragma comment(linker, "/STACK:1024000000,1024000000")
     2 #include<iostream>
     3 #include<cstdio>
     4 #include<cstring>
     5 #include<cmath>
     6 #include<math.h>
     7 #include<algorithm>
     8 #include<queue>
     9 #include<set>
    10 #include<bitset>
    11 #include<map>
    12 #include<vector>
    13 #include<stdlib.h>
    14 #include <stack>
    15 using namespace std;
    16 #define PI acos(-1.0)
    17 #define max(a,b) (a) > (b) ? (a) : (b)
    18 #define min(a,b) (a) < (b) ? (a) : (b)
    19 #define ll long long
    20 #define eps 1e-10
    21 #define MOD 1000000007
    22 #define N 1000000
    23 #define inf 1e12
    24 int n;
    25 double v,a[6];
    26 bool dfs(int t){
    27    if(t==n){
    28       if(fabs(v-a[n])<1e-7){
    29          return true;
    30       }
    31       return false;
    32    }
    33    for(int i=t;i<n;i++){
    34       for(int j=i+1;j<=n;j++){
    35          double temp1=a[i];
    36          double temp2=a[j];
    37          a[i]=a[t];
    38          a[j]=temp1+temp2; if(dfs(t+1)) return true;//
    39          a[j]=temp1-temp2; if(dfs(t+1)) return true;//减1
    40          a[j]=temp2-temp1; if(dfs(t+1)) return true;//减2
    41          a[j]=temp1*temp2; if(dfs(t+1)) return true;//
    42          if(temp1){//除1
    43             a[j]=temp2/temp1; if(dfs(t+1)) return true;
    44          }
    45          if(temp2){//除2
    46             a[j]=temp1/temp2; if(dfs(t+1)) return true;
    47          }
    48          a[i]=temp1;//还原
    49          a[j]=temp2;//还原
    50       }
    51    }
    52    return false;
    53 }
    54 int main()
    55 {
    56    int t;
    57    scanf("%d",&t);
    58    while(t--){
    59       scanf("%d%lf",&n,&v);
    60       for(int i=1;i<=n;i++){
    61          scanf("%lf",&a[i]);
    62       }
    63       if(dfs(1)){
    64          printf("Yes
    ");
    65       }else{
    66          printf("No
    ");
    67       }
    68    }
    69     return 0;
    70 }
    View Code
  • 相关阅读:
    XmlDocument和XDocument转String
    C# 6.0 (C# vNext) 新功能之:Null-Conditional Operator(转)
    <%%>与<scriptrunat=server>,<%=%>与<%#%>的区别(转)
    WINDOWS的用户和用户组说明
    C#获取网页内容的三种方式(转)
    C#操作XML方法:新增、修改和删除节点与属性
    linq to xml操作XML(转)
    C#使用tesseract3.02识别验证码模拟登录(转)
    C#修饰符
    SQL语句备份和还原数据库(转)
  • 原文地址:https://www.cnblogs.com/UniqueColor/p/4984521.html
Copyright © 2011-2022 走看看