HDU 5655 四边形判断

CA Loves Stick

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others)
Total Submission(s): 563 Accepted Submission(s): 202

Problem Description

CA loves to play with sticks.
One day he receives four pieces of sticks, he wants to know these sticks can spell a quadrilateral.
(What is quadrilateral? Click here: https://en.wikipedia.org/wiki/Quadrilateral)

Input

First line contains

Output

For each testcase, if these sticks can spell a quadrilateral, output "Yes"; otherwise, output "No" (without the quotation marks).

Sample Input

2 1 1 1 1 1 1 9 2

Sample Output

Yes No

Source

BestCoder Round #78 (div.2)

题意：输入四边长 a，b，c，d判断能否组成四边形

题解： 1.根据边长的范围要考虑0

2.四边形判断条件：升序排列后最大边小于另外三边之和

3.根据边长的范围：a[0]>a[3]-a[2]-a[1] （加法处理会爆数据范围应当移项减法处理）

 1 #include<iostream>
 2 #include<cstring>
 3 #include<cstdio>
 4 #include<map>
 5 #include<queue>
 6 #include<stack>
 7 #include<algorithm> 
 8 #define ll __int64
 9 #define mod 1 
10 #define PI acos(-1.0)
11 using namespace std;
12 ll a[5];
13 int t;
14 int main()
15 { 
16      scanf("%d",&t);
17      for(int i=1;i<=t;i++)
18 {
19     scanf("%I64d %I64d %I64d %I64d",&a[0],&a[1],&a[2],&a[3]);
20     sort(a,a+4);
21     //cout<<a[0]<<a[1]<<a[2]<<a[3]<<endl;
22     if(a[0]==0||a[1]==0||a[2]==0||a[3]==0)
23     cout<<"No"<<endl;
24     else
25     {
26     if(a[0]>a[3]-a[2]-a[1])
27      cout<<"Yes"<<endl;
28      else
29      cout<<"No"<<endl;
30     }
31 }
32     return 0;
33 }