coding_interview1-1.c

#include "stdio.h"

int unique_1(char* str) {
  int count[256] = {0};
  int i = 0;
  while(1) {
    char c = str[i];
    if (c == '\0') return 1;
    if (count[c] > 0) {
      return -1;
    } else {
      count[c]++;
    }
    i++;
  }
}

int unique_2(char* str) {
  // Sort
}

int main(int argc, char* argv[]) {
  if (argc < 2) {
    fprintf(stderr, "Usage: a.out <input>\n");
    return 1;
  }
  char* str = argv[1];
  printf("Input: %s\n", str);
  printf("Uniquenss: %d\n", unique_1(str));
  return 0;
}