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StringProblemsOne.java
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76 lines (71 loc) · 2.71 KB
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package com.problems;
import java.util.*;
public class StringProblemsOne {
// shortest substring of 's' that has all the characters from string 't'
public String controlSet(String s, String t){
// T(n) : o(n^2)
int[] result = {-1, -1};
int shortest = Integer.MAX_VALUE;
Set<Character> set = new HashSet<>();
for(int i = 0; i < t.length(); i++){
set.add(t.charAt(i));
}
int left = 0;
for(int i = 0; i < s.length(); i++){
Map<Character, Integer> map = new HashMap<>();
for(int j = i; j < s.length(); j++){
//System.out.println(s.substring(i, j+1));
if(set.contains(s.charAt(j))){
map.put(s.charAt(j), map.getOrDefault(s.charAt(j), 0) + 1);
}
if(map.size() == set.size() && j - i + 1 < shortest){
//shortest = Math.min(shortest, j - i + 1);
shortest = j - i + 1;
result[0] = i;
result[1] = j+1;
}
}
}
return s.substring(result[0], result[1]);
}
public String controlSetSlidingWindow(String s, String t){
// T(n) : O(n)
int[] result = {-1, -1};
int shortest = Integer.MAX_VALUE;
Set<Character> set = new HashSet<>();
for(int i = 0; i < t.length(); i++){
set.add(t.charAt(i));
}
int left = 0;
Map<Character, Integer> map = new HashMap<>();
for(int i = 0; i < s.length(); i++){
if(set.contains(s.charAt(i))){
map.put(s.charAt(i), map.getOrDefault(s.charAt(i), 0) + 1);
}
while (map.size() >= set.size()){
map.put(s.charAt(left), map.get(s.charAt(left)) - 1);
if(map.get(s.charAt(left)) == 0){
map.remove(s.charAt(left));
}
left++;
}
//left--;
//map.put(s.charAt(left), map.getOrDefault(s.charAt(left), 0) + 1);
if(map.size() == set.size() && i - left + 1 < shortest){
shortest = i - left + 1;
result[0] = left;
result[1] = i;
}
}
return s.substring(result[0], result[1]);
}
}
class TDStringProblemsOne{
public static void main(String[] args) {
StringProblemsOne obj = new StringProblemsOne();
System.out.println(obj.controlSet("helloworld", "lrw"));
System.out.println(obj.controlSet("helloworwld", "lrw"));
System.out.println(obj.controlSetSlidingWindow("helloworld", "lrw"));
System.out.println(obj.controlSetSlidingWindow("helloworwld", "lrw"));
}
}