Cannibal Characters

Language : C

(NOTE : Try a few times yourself before moving to the solution)

#include <stdio.h>
#include <stdbool.h>
#include <malloc.h>

int Minimum_Operations (int n, char* s) {
   int alpha[26] = {0};

   for(int i = 0; i < n; i++)
   {
       alpha[s[i] - 97]++;
   }
   int sum = 0;
   for(int i = 0; i < 26; i++)
   {
       alpha[i]/=2;
       sum+=alpha[i];
   }
    return sum;
}

int main() {
    int T;
    scanf("%d", &T);
    for(int t_i = 0; t_i < T; t_i++)
    {
        int n;
        scanf("%d", &n);
        char* s = (char*)malloc((n+1) * sizeof(char));
        scanf("\n%[^\n]s", s);

        int out_ = Minimum_Operations(n, s);
        printf("%d", out_);
        printf("\n");
    }
}