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Commit a25a314

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MinimumWindowSubstring o(n2) implementation
1 parent 13e8598 commit a25a314

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package java_problem.slidewindow;
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import java.util.ArrayList;
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import java.util.List;
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public class MinimumWindowSubstring {
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public static void main(String args[]) {
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System.out.println(minWindow("ADOBECODEBANC", "ABC"));
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}
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public static String minWindow(String s, String t) {
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int n1 = s.length();
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int n2 = t.length();
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if (n2 > n1) return "";
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String minWindow = "";
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List<Character> ls = new ArrayList<>();
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StringBuilder sb = new StringBuilder();
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for (int r = 0; r < n1; r++) {
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ls.add(s.charAt(r));
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sb.append(s.charAt(r));
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// Check if the current window contains all characters of t
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while (containsAll(ls, t)) {
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if (minWindow.isEmpty() || sb.length() < minWindow.length()) {
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minWindow = sb.toString();
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}
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ls.remove(0); // Remove the leftmost character from the window
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sb.deleteCharAt(0); // Remove the leftmost character from the StringBuilder
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}
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}
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return minWindow;
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}
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// Helper function to check if all characters in t are present in ls
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private static boolean containsAll(List<Character> ls, String t) {
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List<Character> temp = new ArrayList<>(ls);
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for (char c : t.toCharArray()) {
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if (temp.contains(c)) {
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temp.remove((Character) c); // Remove the character from temp
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} else {
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return false; // If a character is missing, return false
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}
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}
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return true;
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}
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}

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