Problem:Given a sequence of n integers a1, a2, ..., an, a 132 pattern is a subsequence ai, aj, ak such that i < j < k and ai < ak < aj. Design an algorithm that takes a list of n numbers as input and checks whether there is a 132 pattern in the list.
Note: n will be less than 15,000.
Example 1:
Input: [1, 2, 3, 4]
Output: False
Explanation: There is no 132 pattern in the sequence. Example 2:
Input: [3, 1, 4, 2]
Output: True
Explanation: There is a 132 pattern in the sequence: [1, 4, 2].
Example 3: Input: [-1, 3, 2, 0]
Output: True
Explanation: There are three 132 patterns in the sequence: [-1, 3, 2], [-1, 3, 0] and [-1, 2, 0].
My code:
class Solution456{
public boolean find132pattern(int[] nums) {
int i=0,j=i+1,k=j+1;
if(nums.length<3){
return false;
}
while(i<nums.length-2){
if(nums[i]<nums[j] && nums[j]>nums[k]){
return true;
}
else{
i++;
j++;
k++;
}
}
return false;
}
}
Which passes all the above mentioned testcases. But
Cannot pass this test case. I don't know why. For test case int [] nums={1,0,1,-4,-3}; at the second iteration nums[i](which is 0)< nums[j](which is 1) and nums[j]>nums[k](which is -4). So it has 132 pattern. Then why the Expected output will be false**? It should be true.
Can anyone explain me what is the bug in my code or logic?
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