Numbers distribution C - Correction

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define LEN 4

int main(void) {
  printf("Inserisci quante volte vuoi randomizzare: ");
  int n;
  scanf("%d", &n);

  float contan[LEN];

  srand(time(NULL));
  for (int i = 0; i < n; i++) {
    contan[rand() % LEN]++;
  }

  float s = 0.0f;
  for (int i = 0; i < LEN; i++) {
    s += contan[i];
  }
  s = s / 100.0f;

  float p[LEN];
  for (int i = 0; i < LEN; i++) {
    p[i] = contan[i] / s;
  }

  printf("Percentuali:\n\t");
  for (int i = 0; i < LEN; i++) {
    printf("Percentuale di [%d]: %.2f\n\t", i, p[i]);
  }

  return 0;
}