Problem A: Jolly Jumpers
Time Limit: 1 Sec Memory Limit: 64 MBSubmit: 10 Solved: 4
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Description
A sequence of n > 0 integers is called a jolly jumper if the absolute values of the differences between successive elements take on all possible values 1 through n - 1. For instance, 1 4 2 3 is a jolly jumper, because the absolute differences are 3, 2, and 1, respectively. The definition implies that any sequence of a single integer is a jolly jumper. Write a program to determine whether each of a number of sequences is a jolly jumper.
Input
Each line of input contains an integer n < 3, 000 followed by n integers representing the sequence
Output
For each line of input generate a line of output saying ``Jolly'' or ``Not jolly''.
Sample Input
4 1 4 2 3
5 1 4 2 -1 6
Sample Output
Jolly
Not jolly
HINT
水题。
这道题要求输入一串整型数，第一个数为n，后面接着有n个int数，要求后面这n个数两两之间差的绝对值在[1,n-1]范围内，且差的绝对值不能重复。
虽是水题，但还是纠结了一会，原因还是没有读懂题意，忽略了第二个条件。由此可见，英语阅读能力的重要性！
My code:
1 #include <iostream>
2
3 using namespace std;
4
5 int abs(int n)
6 {
7 return n>0?n:-n;
8 }
9 int main()
10 {
11 int n;
12 int ab;
13 int i;
14 int a[3000];
15 while(cin>>n){
16 bool b[3001]={0}; //记录绝对值差有无重复
17 for(i=0;i<n;i++){ //输入
18 cin>>a[i];
19 }
20 for(i=1;i<n;i++){ //循环判断
21 int t=abs(a[i]-a[i-1]);
22 if(!(1<=t && t<=n-1) || b[t] )
23 break;
24 else{
25 b[t]=true;
26 }
27 }
28 if(i==n) //如果正常跳出，说明是个Jolly
29 cout<<"Jolly"<<endl;
30 else{
31 cout<<"Not jolly"<<endl;
32 }
33 }
34 return 0;
35 }
Freecode : www.cnblogs.com/yym2013