242.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdbool.h>
#include<assert.h>

boolisAnagram(char*s, char*t) {
if (s==NULL||t==NULL) return false;

intlens=strlen(s);
intlent=strlen(t);
if (lens!=lent) return false;

intflag[26] = { 0 };
inti;
for (i=0; i<lens; i++){
flag[s[i] -'a']++;
 }

for (i=0; i<lent; i++) {
flag[t[i] -'a']--;
 }

for (i=0; i<26; i++){
if (flag[i] !=0) return false;
 }

return true;
}

intmain() {

assert(isAnagram("anagram", "nagaram") == true);
assert(isAnagram("rat", "car") == false);
assert(isAnagram("aba", "aab") == true);
assert(isAnagram("aba", "ab") == false);

printf("all tests passed!\n");

return0;
}