383. Ransom Note

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class Solution {
public boolean canConstruct(String ransomNote, String magazine) {
int[] count = new int[26];
for (int i = 0; i < magazine.length(); i++) {
count[magazine.charAt(i) - 'a']++;
}

for (int i = 0; i < ransomNote.length(); i++) {
char c = ransomNote.charAt(i);
if (count[c - 'a'] > 0) {
count[c - 'a']--;
} else {
return false;
}
}

return true;
}
}

References

383. Ransom Note