Pointers/arrays

I'm trying to go through a text file I'm passing and keep track of it and the frequency it occurs in the 12 number file. The problem I'm running into is at the frequency part. When I compile and run the code, this is the output:
N: 10 F: 3
N: 10 F: 3
N: 8 F: 1
N: 7 F: 65
N: 5 F: 0
N: 4 F: 63
N: 10 F: 3
N: 2 F: 1
N: 2 F: 32769
N: 8 F: 32767
N: 7 F: 32767
N: 7 F: 12

I would like to set it up as to not create a struct for repeat numbers, instead ONLY increase F by one... as you can see the number prints out correctly but frequency is rather janked up. I know the problem is in calcHistogram somewhere in the loops of chaos. Any tips would be greatly appreciated!

struct freq {
	int number;
	int frequency;
};
void calcHistogram(int* ar, int* count, struct freq* hist, int* ct);
void readScores(int* ar, int* count);
void displayScores(int* ar, int* count);

int main() {
	int ar[100];
	int count = 0;
	int ct = 0;
	
	readScores(ar, &count);
	displayScores(ar, &count);
	
	struct freq hist[count];

	printf("\n");
	calcHistogram(ar, &count, hist, &ct);
}

void readScores(int* ar, int* count) {
	
	//while(2!=EOF){ do this later
	for (int i=0; i<12; i++) {
		(*count)++;
		scanf("%d", (ar+i));
	}
}

void displayScores(int* ar, int* count) {
	for(int i=0; i<*count; i++) {
		printf("score %d: %d\n", i, *(ar+i));
	}
}

void calcHistogram(int* ar, int* count, struct freq* hist, int* ct) {
	int uniqueNumber;
	for(int i=0; i<*count; i++){
		uniqueNumber = *(ar+i);
		for(int j=0; j<=*ct; j++){
			if(uniqueNumber != (*(hist+i)).number){
				(*(hist+i)).number = uniqueNumber;
				
			}
			if(*(ar+i) == *(ar+j)){
				(*(hist+i)).frequency += 1;
				*ct++;
			}
		}
			printf("N: %d F: %d\n", (*(hist+i)).number, (*(hist+i)).frequency);
	}
}