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update at 2022-04-29 13:34:49 by ehlxr

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ehlxr 2022-04-29 13:34:49 +08:00
parent 4160b02787
commit 545e3df7c0
1 changed files with 86 additions and 0 deletions
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budd-common/src/main/java/io/github/ehlxr/algorithm/MinWindow.java Normal file
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/*
* The MIT License (MIT)
*
* Copyright © 2022 xrv <xrv@live.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package io.github.ehlxr.algorithm;
import java.util.HashMap;
import java.util.Map;
/**
* @author ehlxr
* @since 2022-04-29 11:07.
*/
public class MinWindow {
public static void main(String[] args) {
System.out.println(minWindow("cabwefgewcwaefgcf", "cae"));
System.out.println(minWindow("bba", "ab"));
System.out.println(minWindow("ADOBECODEBANC", "ABC"));
System.out.println(minWindow("a", "a"));
System.out.println(minWindow("a", "b"));
System.out.println(minWindow("", "a"));
System.out.println(minWindow("", ""));
System.out.println(minWindow("a", "aa"));
System.out.println(minWindow("aa", "a"));
}
public static String minWindow(String s, String t) {
Map<Character, Integer> windows = new HashMap<>();
Map<Character, Integer> needs = new HashMap<>();
for (int i = 0; i < t.length(); i++) {
needs.put(t.charAt(i), needs.getOrDefault(t.charAt(i), 0) + 1);
}
int left = 0, right = 0, valid = 0, start = -1, len = Integer.MAX_VALUE;
while (right < s.length()) {
char r = s.charAt(right);
if (needs.containsKey(r)) {
windows.put(r, windows.getOrDefault(r, 0) + 1);
if (windows.get(r).equals(needs.get(r))) {
valid++;
}
}
right++;
while (valid == needs.size()) {
if (right - left < len) {
len = right - left;
start = left;
}
char l = s.charAt(left);
left++;
if (windows.containsKey(l)) {
if (windows.get(l).equals(needs.get(l))) {
valid--;
}
windows.put(l, windows.get(l) - 1);
}
}
}
return start > -1 ? s.substring(start, start + len) : "";
}
}