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0076-minimum-window-substring.java

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class Solution {

//sliding window

public String minWindow(String s, String t) {

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

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

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

}

int matched = 0;

int start = 0;

int minLen = s.length() + 1;

int subStr = 0;

for (int endWindow = 0; endWindow < s.length(); endWindow++) {

char right = s.charAt(endWindow);

if (map.containsKey(right)) {

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

if (map.get(right) == 0) matched++;

}

while (matched == map.size()) {

if (minLen > endWindow - start + 1) {

minLen = endWindow - start + 1;

subStr = start;

}

char deleted = s.charAt(start++);

if (map.containsKey(deleted)) {

if (map.get(deleted) == 0) matched--;

map.put(deleted, map.get(deleted) + 1);

}

}

}

return minLen > s.length() ? "" : s.substring(subStr, subStr + minLen);

}

}