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janCallengeEquality.java
48 lines (48 loc) · 1.53 KB
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janCallengeEquality.java
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import java.util.*;
class main{
public static void main(String args[]){
StringBuilder sb = new StringBuilder();
Scanner scn = new Scanner(System.in);
int n = scn.hasNextInt()?scn.nextInt():0;
int arr[] = new int[n];
int q = scn.hasNextInt()?scn.nextInt():0;
int len = arr.length;
for(int i=0;i<n;i++){
arr[i]=scn.hasNextInt()?scn.nextInt():0;
}
int [] inc=new int[n];
int count=1;
for(int i=1;i<n;++i){
i--;
if(i+1<len && arr[i]<arr[i+1]){
while(i+1 < len && arr[i]<arr[i+1]){
if(inc[i]==0)
inc[i]=count;
i++;
}
inc[i]=count;
count++;
}
if(i+1<len && arr[i]>arr[i+1]){
while(i+1<len && arr[i]>arr[i+1]){
if(inc[i]==0)
inc[i]=count;
i++;
}
inc[i]=count;
count++;
}
}
// System.out.println(Arrays.toString(inc));
for(int i=0;i<q;i++){
int start=scn.hasNextInt()?scn.nextInt()-1:0;
int end = scn.hasNextInt()?scn.nextInt()-1:0;
if(inc[start]==inc[start+1]){
sb.append((inc[end]-inc[start]+1)%2==0?"YES":"NO").append("\n");
}else{
sb.append((inc[end]-inc[start])%2==0?"YES":"NO").append("\n");
}
}
System.out.println(sb);
}
}