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Copy pathNextGreater.java
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119 lines (81 loc) · 2.76 KB
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import java.util.Stack;
public class NextGreater {
// next greater
public static long[] nextGreaterRight(long arr[], int n){
long nums[] = new long[arr.length];
Stack<Long> s = new Stack<>();
for(int i=n-1;i>=0;i--){
while( (!s.isEmpty()) && arr[i] >= s.peek()){
s.pop();
}
if(s.isEmpty()){
nums[i] = -1;
}
else{
nums[i] = s.peek();
}
s.push(arr[i]);
}
return nums;
}
public static long[] nextGreaterLeft(long arr[], int n){
long nums[] = new long[arr.length];
Stack<Long> s = new Stack<>();
for(int i=0;i<n;i++){
while( (!s.isEmpty()) && arr[i] >= s.peek()){
s.pop();
}
if(s.isEmpty()){
nums[i] = -1;
}
else{
nums[i] = s.peek();
}
s.push(arr[i]);
}
return nums;
}
public static long[] nextSmallerRight(long arr[], int n){
long nums[] = new long[arr.length];
Stack<Long> s = new Stack<>();
for(int i=n-1;i>=0;i--){
while( (!s.isEmpty()) && arr[i] <= s.peek()){
s.pop();
}
if(s.isEmpty()){
nums[i] = -1;
}
else{
nums[i] = s.peek();
}
s.push(arr[i]);
}
return nums;
}
public static long[] nextSmallerLeft(long arr[], int n){
long nums[] = new long[arr.length];
Stack<Long> s = new Stack<>();
for(int i=0;i<n;i++){
while( (!s.isEmpty()) && arr[i] <= s.peek()){
s.pop();
}
if(s.isEmpty()){
nums[i] = -1;
}
else{
nums[i] = s.peek();
}
s.push(arr[i]);
}
return nums;
}
public static void main(String args[]){
long arr[] = { 7,8,1,4};
int n = arr.length;
long nums2[] = nextSmallerLeft(arr, n);
for(int i=0;i<nums2.length;i++){
System.out.print(nums2[i]+" ");
}
System.out.println();
}
}