HDU 5143 NPY and arithmetic progression DFS

NPY and arithmetic progression

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 309    Accepted Submission(s): 95

Problem Description

NPY is learning arithmetic progression in his math class. In mathematics, an arithmetic progression (AP) is a sequence of numbers such that the difference between the consecutive terms is constant.(from wikipedia)
He thinks it's easy to understand,and he found a challenging problem from his talented math teacher:
You're given four integers, a1,a2,a3,a4, which are the numbers of 1,2,3,4 you have.Can you divide these numbers into some Arithmetic Progressions,whose lengths are equal to or greater than 3?(i.e.The number of AP can be one)
Attention: You must use every number exactly once.
Can you solve this problem?

Input

The first line contains a integer T — the number of test cases (1≤T≤100000).
The next T lines,each contains 4 integers a1,a2,a3,a4(0≤a1,a2,a3,a4≤109).

Output

For each test case,print "Yes"(without quotes) if the numbers can be divided properly,otherwise print "No"(without quotes).

Sample Input

31 2 2 11 0 0 03 0 0 0

Sample Output

YesNoYes
Hint
In the first case,the numbers can be divided into {1,2,3} and {2,3,4}.In the second case,the numbers can't be divided properly.In the third case,the numbers can be divided into {1,1,1}.
/*HDU 5143 DFS 比赛时没看懂题目，参考别人的； DFS多余3个的数可以自己成等比数列和其他数组合成等比数列的有1,2,3,  2,3,4  1,2,3,4 三种情况*/#include<iostream>#include<stdio.h>using  namespace std;bool check(int a,int b,int c,int d)  {          if(a==0&&b==0&&c==0&&d==0) return true;  //数为0，或者>=3     if( ((a!=0&&a>=3)||(a==0)) && ((b!=0&&b>=3)||(b==0)) && ((c!=0&&c>=3)||(c==0)) && ((d!=0&&d>=3)||(d==0)) ) return true;        if(a-1>=0&&b-1>=0&&c-1>=0&&d-1>=0)  //1234        if(check(a-1,b-1,c-1,d-1)) return true;        if(a-1>=0&&b-1>=0&&c-1>=0)  //123        if(check(a-1,b-1,c-1,d)) return true;        if(b-1>=0&&c-1>=0&&d-1>=0)  //234        if(check(a,b-1,c-1,d-1)) return true;      return false;  }  int main(){int t,a,b,c,d,sum;scanf("%d",&t);while(t--){scanf("%d%d%d%d",&a,&b,&c,&d);if(check(a,b,c,d))printf("Yes\n");elseprintf("No\n");}return 0;}