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1347_minSteps.java

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class Solution {

public int minSteps(String s, String t) {

if(s == null || t == null) return 0;

if(s.length()!= t.length()) return 0;

HashMap<Character, Integer> map = new HashMap<>();

for(char c: s.toCharArray()){

map.put(c, map.getOrDefault(c, 0)+1);

}

for(char c: t.toCharArray()){

if(!map.containsKey(c)) continue;

if(map.get(c) > 1){

map.put(c, map.get(c)-1);

}

else if(map.get(c) == 1){

map.remove(c);

}

}

int res = 0;

for(char c: map.keySet()){

res += map.get(c);

}

return res;

}

}