Numbers
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/262144 K (Java/Others)Total Submission(s): 924 Accepted Submission(s): 517
Problem Description
There are n numbers
A1,A2....An
,your task is to check whether there exists there different positive integers i, j, k (
1≤i,j,k≤n
) such that
Ai−Aj=Ak
Input
There are multiple test cases, no more than 1000 cases.
First line of each case contains a single integer n. (3≤n≤100) .
Next line contains n integers A1,A2....An . (0≤Ai≤1000)
First line of each case contains a single integer n. (3≤n≤100) .
Next line contains n integers A1,A2....An . (0≤Ai≤1000)
Output
For each case output "YES" in a single line if you find such i, j, k, otherwise output "NO".
Sample Input
3 3 1 2 3 1 0 2 4 1 1 0 2
Sample Output
YES NO YES
Source
BestCoder上的一道水题,碰巧看见了。
不多说,没优化,但能过。O(n^3) 暴力
#include <stdio.h>
#include <algorithm>
using namespace std;
const int MAXN=105;
int a[MAXN];
int main()
{
int n;
while(scanf("%d",&n)>0)
{
for(int i=0;i<n;i++)
scanf("%d",&a[i]);
sort(a,a+n);
int isOk=0;
for(int i=0;i<n;i++)
for(int j=i+1;j<n;j++)
for(int k=j+1;k<n;k++)
if((a[i]+a[j])==a[k])
{
isOk=1;
break;
}
if(isOk)
printf("YES\n");
else
printf("NO\n");
}
return 0;
}