Beecrowd 3159 - C

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

#define f(i, s, t) for (int i = s; i < t; ++i)

int main() {
  int ns[125], ns1[125];
  ns['a'] = 2, ns['b'] = 2, ns['c'] = 2;
  ns['d'] = 3, ns['e'] = 3, ns['f'] = 3;
  ns['g'] = 4, ns['h'] = 4, ns['i'] = 4;
  ns['j'] = 5, ns['k'] = 5, ns['l'] = 5;
  ns['m'] = 6, ns['n'] = 6, ns['o'] = 6;
  ns['p'] = 7, ns['q'] = 7, ns['r'] = 7, ns['s'] = 7;
  ns['t'] = 8, ns['u'] = 8, ns['v'] = 8;
  ns['w'] = 9, ns['x'] = 9, ns['y'] = 9, ns['z'] = 9;
  ns[' '] = 0;

  ns1['a'] = 1, ns1['b'] = 2, ns1['c'] = 3;
  ns1['d'] = 1, ns1['e'] = 2, ns1['f'] = 3;
  ns1['g'] = 1, ns1['h'] = 2, ns1['i'] = 3;
  ns1['j'] = 1, ns1['k'] = 2, ns1['l'] = 3;
  ns1['m'] = 1, ns1['n'] = 2, ns1['o'] = 3;
  ns1['p'] = 1, ns1['q'] = 2, ns1['r'] = 3, ns1['s'] = 4;
  ns1['t'] = 1, ns1['u'] = 2, ns1['v'] = 3;
  ns1['w'] = 1, ns1['x'] = 2, ns1['y'] = 3, ns1['z'] = 4;
  ns1[' '] = 1;

  int n;
  size_t size = 150;
  char * p = (char*) malloc(size * sizeof(char)), ant;
  while(scanf("%d", &n) != EOF) {
    getline(&p, &size, stdin);
    f(i,0,n) {
      getline(&p, &size, stdin);
      ant = '-';
      f(j,0,strlen(p) - (p[strlen(p)-1] == 10)) {
        if(p[j] != 32 && p[j] < 97) printf("#"), p[j] += 32;
        else if(ns[ant] == ns[p[j]]) printf("*");
        f(k,0,ns1[p[j]]) printf("%d", ns[p[j]]);
        ant = p[j];
      }
      printf("\n");
    }
  }
}