I'm asked to find the highest frequency from an array of elements and all elements with said frequency. My code seem to work just fine but it seems to have a mistake somewhere when i submit it. Can anyone help me find the error?
Format Input: The first line contains an integer T stating the number of test cases. For each test case, the first line contains a single integer N which indicate the number of element in the array. The next line contains N integers Xi (1≤i≤N) which indicate ith element in the array.
Format Output: Consists of T lines where each line has the format “Case #X: Y ”, where X is the test case number starting at 1 and Y is the highest frequency. Next line contains all elements which have that frequency sorted in ascending order.
Constraints: 1 ≤ T ≤ 20 | 2 ≤ N ≤ 20.000 | 1 ≤ Xi ≤ 2 × 10^5
Sample Input:
3
8
1 1 2 2 3 4 5 5
8
5 5 4 3 2 2 1 1
4
1 1 1 3
Sample Output:
Case #1: 2
1 2 5
Case #2: 2
1 2 5
Case #3: 3
1
Here is my code:
#include <stdio.h>
int main() {
int T, N[20];
scanf("%d", &T); getchar();
int A[T][20000];
for (int i = 0; i<T; i++) {
scanf("%d", &N[i]); getchar();
for (int j = 0; j<N[i]; j++) {
scanf("%d", &A[i][j]); getchar();
}
int X = 0;
for (int j = 0; j<N[i]; j++) {
for (int k = j + 1; k<N[i]; k++) {
if (A[i][k]<A[i][j]) {
X = A[i][j];
A[i][j] = A[i][k];
A[i][k] = X;
}
}
}
}
int f[20000];
for (int i = 0; i<T; i++) {
int c = 0, mc = 0;
for (int j = 0; j<N[i]; j++) {
c = 1;
if(A[i][j] != -1) {
for (int k = j+1; k<N[i]; k++) {
if (A[i][j] == A[i][k]) {
c++;
A[i][k] = -1;
}
}
f[j]=c;
}
if (c>mc) {
mc = c;
}
}
printf("Case #%d: %d\n", i+1, mc);
for (int j = 0; j<N[i]; j++) {
if (A[i][j] != -1) {
if (f[j] == mc) {
printf ("%d", A[i][j]);
if (j<N[i]-1) {
printf(" ");
}
}
}
}
printf("\n");
}
return 0;
}
EDIT So I made another code where instead of inputting all arrays at once and outputting everything at once, this code outputs the frequency and elements after i input the first arrays of numbers. But it seems like the code still have problems and i can't find where... P.s I'm pretty new to this, so i apologise for the lack of efficiency of my codes.
NEW CODE
#include <stdio.h>
int main() {
int T, N;
scanf("%d", &T); getchar();
int A[20000];
for (int i = 0; i<T; i++) {
scanf("%d", &N); getchar();
for (int j = 0; j<N; j++) {
scanf("%d", &A[j]); getchar();
}
int X;
for (int j = 0; j<N; j++) {
for (int k = j + 1; k<N; k++) {
if (A[k]<A[j]) {
X = A[j];
A[j] = A[k];
A[k] = X;
}
}
}
int f[N], c = 0, mc = 0;
for (int j = 0; j<N; j++) {
c = 1;
if(A[j] != -1) {
for (int k = j+1; k<N; k++) {
if (A[j] == A[k]) {
c++;
A[k] = -1;
}
}
f[j]=c;
if (c>mc) {
mc = c;
}
}
}
printf("Case #%d: %d\n", i+1, mc);
for (int j = 0; j<N; j++) {
if (A[j] != -1) {
if (f[j] == mc) {
printf ("%d", A[j]);
if (j<N-1) {
printf(" ");
}
}
}
}
printf("\n");
}
return 0;
}
It took me a couple of days but i finally got how to do this. Apparently, it was not as complicated as i thought... here is the working code. Thanks to everyone who helped :)
#include <stdio.h>
int main() {
int T, N;
scanf("%d", &T);
for (int i = 0; i<T; i++) {
scanf("%d", &N); getchar();
//INPUT elements and counting frequncy for each element
int f[200001] = {0}, E = 0;
for (int j = 0; j<N; j++) {
scanf("%d", &E); getchar();
f[E]++;
}
//find max frequency and how many elements with max frequency
int max = 0, c = 0;
for (int j = 1; j<200001; j++) {
if (f[j] == max) {
c ++;
}
if (f[j]>max) {
max = f[j];
c = 1;
}
}
//OUTPUT result
printf("Case #%d: %d\n", i+1, max);
int counter = 0;
for (int j = 1; j<200001; j++) {
if (f[j] == max) {
counter ++;
if (counter<c){
printf("%d ", j);
} else {
printf("%d\n", j);
}
}
}
}
return 0;
}