代码随想录算法训练营Day60|单调栈01
一、739. 每日温度
class Solution {
public int[] dailyTemperatures(int[] temperatures) {
int lens=temperatures.length;
int result[]=new int[lens];
Deque<Integer> stack=new LinkedList<>();
stack.push(0);
for(int i=0;i<lens;i++){
if(temperatures[i]<=temperatures[stack.peek()]){
stack.push(i);
}
else{
while(!stack.isEmpty()&&temperatures[i]>temperatures[stack.peek()]){
result[stack.peek()]=i-stack.peek();
stack.pop();
}
stack.push(i);
}
}
return result;
}
}
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
二、496.下一个更大元素 I
class Solution {
public int[] nextGreaterElement(int[] nums1, int[] nums2) {
Stack<Integer> temp = new Stack<>();
int[] res = new int[nums1.length];
Arrays.fill(res,-1);
HashMap<Integer, Integer> hashMap = new HashMap<>();
for (int i = 0 ; i< nums1.length ; i++){
hashMap.put(nums1[i],i);
}
temp.add(0);
for (int i = 1; i < nums2.length; i++) {
if (nums2[i] <= nums2[temp.peek()]) {
temp.add(i);
} else {
while (!temp.isEmpty() && nums2[temp.peek()] < nums2[i]) {
if (hashMap.containsKey(nums2[temp.peek()])){
Integer index = hashMap.get(nums2[temp.peek()]);
res[index] = nums2[i];
}
temp.pop();
}
temp.add(i);
}
}
return res;
}
}
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29