Help me in solving LPYAS171 problem

help
,
1

My issue

why i am getting run time error

My code

#include <stdio.h>

int main() {
	int t;
	scanf("%d",&t);
	while(t--){
	    int N;
	    scanf("%d",&N);
	    int arr[N];
	    for(int i=0;i<N;i++){
	        scanf("%d",arr[i]);
	    }
	    
	    
	    for(int i=0;i<N;i++){
	        int frq = 0;
	       for(int i=0;i<N;i++){
	       if(arr[i]==arr[i+1]){
	           frq= frq+1;
	           
	       }
	       arr[i]==frq;
	       
	    }	
	    

	    }	
	    
	    for(int i=0;i<N;i++){
	        printf("%d",arr[i]);
	    }

}}

Learning course: Roadmap to 3*
Problem Link: Frequency of each element in the array in Roadmap to 3*