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581_Shortest_Unsorted_Continuous_Subarray.java
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87 lines (85 loc) · 2.79 KB
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public class Solution {
// https://leetcode.com/problems/shortest-unsorted-continuous-subarray/solution/
/* public int findUnsortedSubarray(int[] nums) {
int[] snums = nums.clone();
Arrays.sort(snums);
int start = snums.length, end = 0;
for (int i = 0; i < snums.length; i++) {
if (snums[i] != nums[i]) {
start = Math.min(start, i);
end = Math.max(end, i);
}
}
return (end - start >= 0 ? end - start + 1 : 0);
} */
public int findUnsortedSubarray(int[] nums) {
Stack < Integer > stack = new Stack < Integer > ();
int l = nums.length, r = 0;
for (int i = 0; i < nums.length; i++) {
while (!stack.isEmpty() && nums[stack.peek()] > nums[i])
l = Math.min(l, stack.pop());
stack.push(i);
}
stack.clear();
for (int i = nums.length - 1; i >= 0; i--) {
while (!stack.isEmpty() && nums[stack.peek()] < nums[i])
r = Math.max(r, stack.pop());
stack.push(i);
}
return r - l > 0 ? r - l + 1 : 0;
}
/* public int findUnsortedSubarray(int[] nums) {
int min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
boolean flag = false;
for (int i = 1; i < nums.length; i++) {
if (nums[i] < nums[i - 1])
flag = true;
if (flag)
min = Math.min(min, nums[i]);
}
flag = false;
for (int i = nums.length - 2; i >= 0; i--) {
if (nums[i] > nums[i + 1])
flag = true;
if (flag)
max = Math.max(max, nums[i]);
}
int l, r;
for (l = 0; l < nums.length; l++) {
if (min < nums[l])
break;
}
for (r = nums.length - 1; r >= 0; r--) {
if (max > nums[r])
break;
}
return r - l < 0 ? 0 : r - l + 1;
} */
/* public int findUnsortedSubarray(int[] nums) {
int min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
boolean flag = false;
for (int i = 1; i < nums.length; i++) {
if (nums[i] < nums[i - 1])
flag = true;
if (flag)
min = Math.min(min, nums[i]);
}
flag = false;
for (int i = nums.length - 2; i >= 0; i--) {
if (nums[i] > nums[i + 1])
flag = true;
if (flag)
max = Math.max(max, nums[i]);
}
int l, r;
for (l = 0; l < nums.length; l++) {
if (min < nums[l])
break;
}
for (r = nums.length - 1; r >= 0; r--) {
if (max > nums[r])
break;
}
return r - l < 0 ? 0 : r - l + 1;
} */
}